The chemical composition of mineral Johnsomervilleite is indicated by the formula Na2Ca(Mg,Fe++,Mn)7(PO4)6. Johnsomervilleite is considered as an accessory mineral in podiform metamorphic segregations in kyanite-sillimanite-grade gneiss. This mineral is commonly found from its type of locality at Glen Cosaidh, Loch Quoich,, Inverness-shire, Scotland. Johnsomervilleite was named for John M. Somerville (1908-1978), who collected the first […]
The chemical composition of mineral Johnsenite-(Ce) is indicated by the formula Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2. Johnsenite-(Ce) commonly occurs as an intergrown with zirsilite-(Ce) in a cavity near the margin of a marble xenolith in an igneous breccia along the contact between porphyritic nepheline syenite and sodalite sye nite. This mineral is a known member of the Eudialyte group. […]
The chemical composition of mineral Johninnesite is indicated by the formula Na2Mg4Mn++12(AsO4)2(Si12O35)(OH)6. Johninnesite is also found in low temperature hydrothermal veins cutting metamophosed Fe-Mn ores. Mineral Johninnesite is commonly found from its type of locality at Kombat mine, located 37 km east of Otavi and 49 km south of Tsumeb in the north-central part of […]
The chemical formula of mineral Johnbaumite is indicated by Ca5(AsO4)3(OH). This Johnbaumite is known as an analog of hydroxylapatite and (OH) analog of svabite. Johnbaumite is commonly found from its type of locality at Palmer Shaft, Franklin mine, Franklin, Sussex County, New Jersey, USA. Mineral Johnbaumite was named for John L. Baum (1916-), resident geologist […]
The chemical formula of mineral Johillerite is indicated by Na(Mg,Zn)3Cu(AsO4)3. This mineral Johillerite is commonly found in cavities at altered tennantite-chalcocite ore. Johillerite is most commonly found from its type of locality at Tsumeb, Namibia. Mineral Johillerite was named for Johannes Eric Hiller (1911-1972), professor of mineralogy, Stuttart, Germany. Johillerite is known to crystallize in […]
The chemical formula of mineral Johannsenite is indicated by CaMnSi2O6. This mineral is most commonly found occurring in contact metasomatic rocks. Johannsenite is also usually found from its type of locality at the Empire Zinc Company mine near Hanover, Grant County, New Mexico. Mineral Johannsenite was named after Prof. Albert Johannsen of the University of […]
