Optical Mineralogy

Denningite

suze08 — Tue, 31 Jan 2012 05:37:32 +0000

The chemical formula of mineral Denningite is indicated by (Mn,Zn)Te2O5. Mineral Denningite is also commonly found occurring at Hydrothermal Au-Te deposit. It can be also found from its type of locality at Moctezuma (Bambolla) mine, 12 km south of Moctezuma, Sonora, Mexico. Mineral Denningite was named for Reynolds McConnell Denning (1916-1967), Professor of Mineralogy, University of Michigan, Ann Arbor, Michigan, USA. Denningite is also known to crystallize in the tetragonal system of crystal formation. In optical mineralogy, this tetragonal system comprises crystals having three axes, which are all in a position perpendicular to one another. Two axes are usually found having the same or equal length. Mineral Denningite is also known to have perfect cleavage on one direction which can be more clearly exhibited when viewed with the aid of polarizing microscope for mineralogists. Mineral Denningite is also found colorless or light green in hand sample. The density measure of mineral Denningite is found to be 5.05 grams per cubic centimeters. Most crystals of mineral Denningite are found transparent in appearance. It is also known to have conchoidal fractures developed in brittle materials characterized by smoothly curving surfaces, similar to quartz. The hardness measure of mineral Denningite is usually found 4 when evaluated using the Mohs scale method. It has adamantine luster when evaluated in reflected light of polarized microscope. Denningite is also found leaving a white streak when rubbed on white porcelain streak plate. This mineral has uniaxial positive figure with 0.1100 birefringence when specimen is evaluated closely with the aid of polarizing microscope for mineralogists. Mineral Denningite is found to be not radioactive when chemically evaluated.

Denisovite

suze08 — Tue, 31 Jan 2012 05:26:23 +0000

The chemical formula of mineral Denisovite is indicated by (K,Na)Ca2Si3O8(F,OH). This mineral is commonly occurring in nepheline syenite in a differentiated alkalic massif. Denisovite can be also found from its type of locality at Mts. Eveslogchorr and Yukspor, Khibiny massif, Kola Peninsula, and in the Murun massif, southwest of Olekminsk, Yakutia, Russia. Denisovite was named for Aleksander Petrovich Denisov (1918-1972), Russian specialist in X-ray investigations of minerals, of the Kola Scientific Center, Russia. Denisovite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis. It has indistinct cleavage on one direction which can be more clearly visible when viewed with the aid of polarizing microscope for mineralogists. Denisovite is also found showing greenish gray or gray color in hand sample. Mineral Denisovite is known to have a density measure of 2.76 grams per cubic centimeters. Denisovite crystals are found to be brittle in structure. This is generally displayed by glasses and most non-metallic minerals. The hardness measure of Denisovite is usually found ranging from 4 to 5 when evaluated using the Mohs scale method. It is also found exhibiting pearly luster in reflected light of polarizing microscope. It is also leaving a gray white streak when rubbed on white porcelain streak plate. Denisovite has biaxial positive figure and 0.0090 birefringence when specimen is evaluated between crossed nicols of polarizing microscope. Denisovite is known to have barely detectable radioactivity after chemical evaluation.

Demesmaekerite

suze08 — Tue, 31 Jan 2012 05:13:45 +0000

The chemical formula of mineral Demesmaekerite is indicated by Pb2Cu5(UO2)2(SeO3)6(OH)6•2(H2O). It is commonly found occurring from the lower part of the oxidation zone. Mineral Demesmaekerite is also found from its type of locality at Musonoi mine, Kolwezi, Shaba, Zaire. This mineral was named for Gaston Demesmaeker (1911-), Belgian mining geologist, who studied the Shikolobwe uranium deposits. Demesmaekerite is known to crystallize in the triclinic system of crystal formation. In optical mineralogy, this triclinic crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another. Mineral Demesmaekerite has no cleavage displayed when evaluated closely with the aid of polarizing microscope. Demesmaekerite is also found colored brown, brownish green, green or bottle green in hand sample. The density measure of mineral Demesmaekerite is usually found 5.28 grams per cubic centimeters. The crystal habit of mineral Demesmaekerite as described in the field of optical mineralogy usually includes aggregates in form. This is made of numerous individual crystals or clusters that are more interesting when evaluated with the aid of polarized microscope. The hardness measure of mineral Demesmaekerite is usually found ranging from 3 to 4 when evaluated using the Mohs scale method. Demesmaekerite is also found with biaxial positive figure and 0.0750 birefringence when specimen is evaluated using the Mohs scale method. Demesmaekerite is also found showing very strong radioactivity after chemical evaluation.

Demartinite

suze08 — Tue, 31 Jan 2012 05:02:38 +0000

The chemical formula of mineral Demartinite is indicated by K2[SiF6]. The first specimen of this mineral was collected in April 2006 from a fumarole at the crater rim. This mineral is polymorphous with hieratite. Demartinite is commonly found occurring from its type of locality at La Fossa crater, Vulcano, Eolian Islands, Italy. Demartinite was named for Francesco Demartin (b. 1953), who has made significant contributions to the chemistry of metallic clusters and to the crystal structure of Alpine rare-earth minerals and uranium minerals. Demartinite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. This mineral is commonly found colorless in hand sample. The density measure of mineral Demartinite is commonly found 2.85 grams per cubic centimeters. Most crystals are found transparent in appearance. The crystal habit of mineral Demartinite as described in the field of optical mineralogy usually includes hexagonal form with six-sided crystal shape in cross-section or habit. It can be found showing vitreous or glassy luster in reflected light of polarizing microscope for mineralogists. Demartinite is also found leaving a white streak when rubbed on white porcelain streak plate. This mineral is found showing uniaxial negative figure with 0.0100 birefringence when specimen is evaluated using the Mohs scale method. Demartinite is known to have barely detectable radioactivity when chemically evaluated.

Delvauxite

suze08 — Tue, 31 Jan 2012 04:50:30 +0000

The chemical composition of mineral Delvauxite is indicated by the formula CaFe+++4(PO4,SO4)2(OH)8•4-6(H2O). This mineral is commonly found occurring in a gossan. It can be also found from its type of locality at Berneau, near Vise, Liège, Belgium. Delvauxite was named after J.S.P.J. Delvaux de Feuffe (1782-1863), Belgian chemist who first described and analyzed the mineral. Mineral Delvauxite is known to be amorphous. It has no cleavage displayed even when closely evaluated with the aid of polarized microscope. Delvauxite is commonly found in shades of yellowish brown, brown, reddish brown or brownish black in hand sample. The density measure of mineral Delvauxite is usually found ranging from 1.8 to 2 grams per cubic centimeters, with an average of 1.9. Delvauxite is also found to show conchoidal fractures developed in brittle materials characterized by smoothly curving surfaces, similar to quartz. Delvauxite is known to be amorphous or without any crystalline form or imitative shape. Sometimes it can be concretionary showing rounded massive fine-grained materials. Mineral Delvauxite is also found to be stalactitic or shaped like pendant columns as stalactites or stalagmites similar to calcite. The hardness measure of mineral Delvauxite is usually found 2.5 when evaluated using the Mohs scale method. Delvauxite is also exhibiting vitreous to greasy luster in reflected light of petrographic polarizing microscope. It is also commonly found leaving yellow streak when rubbed on white porcelain streak plate. Delvauxite is known be an isotropic mineral. Mineral Delvauxite is also found not radioactive after chemically evaluated.

Deloryite

suze08 — Tue, 31 Jan 2012 04:21:03 +0000

The chemical formula of mineral Deloryite is indicated by Cu4(UO2)(MoO4)2(OH)6. This mineral is commonly found occurring in oxidized portion of a uranium deposit in sandstone. This mineral is also commonly found from its type of locality at Cap Garonne mine, near le Pradet, Var, France. Mineral Deloryite was named for Jean Claude Delory (1953- ), French mineral collector and land surveyor, Toulon, France, who collected the first specimens. Deloryite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis. Mineral Deloryite is commonly found showing a perfect cleavage on one direction. Mineral Deloryite is commonly found colored dark green in hand sample. The density measure of mineral Deloryite is 4.9 grams per cubic centimeters. Most crystals of mineral Deloryite are found transparent to subopaque in appearance. The hardness measure of mineral Deloryite is found 4 when evaluated using the Mohs scale method. Mineral Deloryite is also found showing vitreous or glassy luster in reflected light of polarizing microscope for mineralogists. Mineral Deloryite is also found leaving a green streak when rubbed on white porcelain streak plate. Mineral Deloryite is also found exhibiting biaxial figure with 0.0600 birefringence when specimen is evaluated between crossed nicols of polarizing microscope used in the field of optical mineralogy. Deloryite is also found showing very strong radioactivity when chemically evaluated.

Delrioite

suze08 — Tue, 31 Jan 2012 04:14:17 +0000

The chemical formula of mineral Delrioite is indicated by CaSrV2O6(OH)2•3(H2O). Delrioite is commonly found occurring as coatings on sandstone. This mineral is usually found from its type of locality at Jo Dandy mine, Montrose County, Colorado, USA. Delrioite was named for Andres M. del Rio (1764-1849), Mexican mineralogist, who discovered vanadium. Delrioite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis. Mineral Delrioite is commonly found colored yellow brown, light yellow green or dark green in hand sample. The density measure of mineral Delrioite is found to be 3.1 grams per cubic centimeters. Most crystals of mineral Delrioite are found translucent appearance. The crystal habit of mineral Delrioite as described in the field of optical mineralogy usually includes acicular crystals occurring as needle-like crystals which can be more fascinating when evaluated with the aid of polarized microscope. It can be also found in aggregates form. This is made of numerous individual crystals or clusters. Mineral Delrioite is also found in radial form with crystals radiating from a center without producing stellar forms similar to stibnite. The hardness measure of mineral Delrioite is usually found 2 when evaluated using the Mohs scale method. Mineral Delrioite is also showing vitreous or glassy luster in reflected light of polarizing microscope. Delrioite is leaving a pale yellow green streak when rubbed on white porcelain streak plate. Mineral Delrioite is also found with biaxial negative figure and 0.0830 birefringence when specimen is evaluated between crossed nicols of polarizing microscope for mineralogists. Delrioite is also known to be pleochroic showing colorless, pale yellow and yellow color. Delrioite is found to be not radioactive when chemically evaluated.

Deloneite-(Ce)

suze08 — Mon, 30 Jan 2012 13:16:59 +0000

The chemical formula of mineral Deloneite-(Ce) is indicated by NaCa2SrCe(PO4)3F. Deloneite-(Ce) is commonly found forming in Carbonitite igneous rocks. This mineral was first found from Mount Koashva, Khibina alkaline massif, Kola Peninsula, Russia. Deloneite-(Ce) was named for B. N. Delone (Delaunay) (1890-1980), Russian mathematical crystallographer. Deloneite-(Ce) is known to crystallize in the trigonal system of crystal formation. This mineral has fair cleavage display in two different directions, all of which are more clearly exhibited when evaluated with the aid of polarizing microscope for mineralogists. Mineral Deloneite-(Ce) is commonly found colored bright yellow in hand sample. The density measure of the mineral is commonly found ranging from 3.92 to 3.95 grams per cubic centimeters with an average of 3.93. Most crystals of this mineral are found transparent in appearance. Deloneite-(Ce) crystals are known to be brittle. This is generally displayed by glasses and most non-metallic minerals. The crystal habit of mineral Deloneite-(Ce) as described in the field of optical mineralogy usually includes granular forms. This is generally occurring as anhedral to subhedral crystals in matrix. The hardness measure of mineral Deloneite-(Ce) is usually found 5 when evaluated using the Mohs scale method. Deloneite-(Ce) is also exhibiting vitreous or glassy luster in reflected light of polarizing microscope for geologists. It is found to be leaving a white streak when rubbed on white porcelain streak plate. Deloneite-(Ce) is known to have biaxial negative figure with 0.0220 birefringence when specimen is evaluated between crossed nicols of polarizing microscope. Deloneite-(Ce) is found to be weakly radioactive when chemically evaluated.

Dellaventuraite

suze08 — Mon, 30 Jan 2012 13:13:39 +0000

The chemical composition of mineral Dellaventuraite is indicated by the formula NaNa2(Mg2,Mn+++,Li,Ti)Si8O22O2. Dellaventuraite commonly occurs with leakeite, kornite, albite, braunite, and bixbyite associated with cross-cutting epigenetic veins that have reacted with regionally metamorphosed rocks containing Mn-rich minerals. Dellaventuraite is a known member of the Amphibole group. This mineral is commonly found from its type of locality at Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. Dellaventuraite was named for Giancarlo Della Ventura, Università degli Studi di Roma Tre, for his extensive work on the crystal chemistry of synthetic amphiboles. Dellaventuraite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis. Mineral Dellaventuraite is known to have perfect cleavage in two different directions, all of which are more clearly exhibited when evaluated with the aid of polarizing microscope for geologists. It is commonly found pinkish red in hand sample. Most crystals of Dellaventuraite are found transparent in appearance. Crystals of this mineral are also found brittle. This is generally displayed by glasses and most non-metallic minerals. The crystal habit of mineral Dellaventuraite as described in the field of optical mineralogy usually includes anhedral grains. This is one of those granular minerals without the expression of crystal shapes. The hardness measure of Dellaventuraite is usually found 5 when evaluated using the Mohs scale method. Dellaventuraite specimens are found showing vitreous or glassy luster when viewed in reflected light of polarized microscope for mineralogists. Dellaventuraite is also leaving pale pink streak when rubbed on white porcelain streak plate. Mineral Dellaventuraite is known to be of biaxial positive figure with 0.0330 birefringence when specimen is evaluated between crossed nicols of polarizing microscope. Dellaventuraite is also found to have barely detectable radioactivity when chemically evaluated.

Dellaite

suze08 — Mon, 30 Jan 2012 12:14:32 +0000

The chemical formula of mineral Dellaite is indicated by Ca6Si3O11(OH)2. Dellaite is commonly found occurring at late-stage veins cutting a metamorphic assemblage. It can be also found from its type of locality at Kilchoan, Ardnamurcan, Scotland. Dellaite was named for Della Martin Roy (1926-), Pennsylvania State University geochemist who first synthesized this phase. Dellaite is known to crystallize in the triclinic system of crystal formation. In optical mineralogy, this triclinic crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another. Mineral Dellaite is commonly found colorless in hand sample. The density measure of mineral Dellaite is usually found 2.94 grams per cubic centimeters. Most crystals of mineral Dellaite are found transparent in appearance. Dellaite is usually found exhibiting vitreous or glassy luster in reflected light of polarized microscope. Mineral Dellaite is leaving white streak when rubbed on white porcelain streak plate. Dellaite is found to be not radioactive after chemically evaluated.