The chemical formula of mineral Jeppeite is indicated by (K,Ba)2(Ti,Fe+++)6O13. Jeppeite is usually found from a large, weathered lamproite plug. This mineral is most commonly found at its type of locality at Wolgidee Hills, West Kimberley district, Western Australia. Jeppeite was named for John Frederick Biccard Jeppe (1920-), geologist of Nedlands, Western Australia, discoverer of […]
The chemical formula of mineral Jentschite is indicated by TlPbAs2SbS6. This mineral is commonly found from its type of locality at Lengenbach, Binntal, Switzerland. Mineral Jentschite was named after Franz Jentsch (1868-1908), head of the Binn syndicate that worked the sulfosalt deposit at the Lengenbach quarry. Jentschite is known to crystallize in the monoclinic system […]
The chemical formula of mineral Jensenite is indicated by Cu3TeO6•2(H2O). Jensenite is considered as a secondary alteration of Cu and Te ore minerals. Mineral Jensenite is commonly found at its type of locality at the dumps of the Centennial Eureka mine, Tintic district, Juab County, Utah, USA. Jensenite was named for Mr. Matin C. Jensen […]
The chemical formula of mineral Jennite is indicated by Ca9Si6O18(OH)6•8H2O. Jennite is considered as a late stage mineral in metamorphosed limestone. This mineral is most commonly found at its type of locality at Crestmore Quarry, 5 miles NW of Riverside, Riverside Co. California. Mineral Jennite was named for Clarence Marvin Jenni (1896-1973), American mineral collector […]
The chemical formula of mineral Jeffreyite is indicated by (Ca,Na)2(Be,Al)Si2(O,OH)7. Jeffreyite is commonly found in a cavity in a highly calcium-metasomatized granite dike. This mineral is commonly found at its type of locality at Jeffrey mine, Asbestos, Quebec, Canada. Named for the locality. Jeffreyite is known to crystallize in the orthorhombic system of crystal formation. […]
The chemical formula of mineral Jedwabite is indicated by Fe7(Ta,Nb)3. Jedwabite was first discovered in platiniferous placers in the Nizhnetagilsky District in the Middle Urals, in a collection made by P. Walther at the beginning of the 20th century, in association with niobocarbide and a tantalum carbide. Mineral Jedwabite is commonly found at its type […]
The chemical composition of mineral Jeanbandyite is indicated by the formula Fe3+0.7Mn2+0.2Sn0.8(OH)6. This mineral is commonly found occurring at the oxide zone of polymetallic hydrothermal deposits epitaxially overgrown on wickmanite or natanite. Llallagua, Bolivia. Jeanbandyite was named for Jean A. Bandy, Wickenburg, Arizona, USA, who, with her husband Mark Bandy, translated Agricola’s “De Natura Fossilium” […]
The chemical formula of mineral Jasmundite is indicated by Ca11(SiO4)4O2S. Jasmundite is commonly occurring in metamorphosed limestone inclusions in basalt. Jasmundite is commonly found at its type of locality at Bellerberg volcano, two km north of Mayen, Eifel district, Germany. Mineral Jasmundite was named for Karl Jasmund, retired Director of the Mineralogical-Petrographic Institute, University of […]
The chemical formula of mineral Jaskolskiite is indicated by Pb2+xCux(Sb,Bi)2-xS5, x=0.2. Jaskolskiite is commonly found occurring in aggregates of sulfosalts in Cu-Co ores of the fahlband type. This mineral is usually found at its type of locality in the Vena deposit, Narke, Bergslangen metallic province, Sweden. Mineral Jaskolskiite was named for Stanislaw Jaskolski (1896-1981), of […]
The chemical composition of mineral Jarosewichite is indicated by the formula Mn2+3Mn3+(AsO4)(OH)6. Mineral Jarosewichite is usually found occurring at metamorphosed Zn-Mn deposit. Jarosewichite is also found at its type of locality at Franklin, Sussex County, New Jersey, USA. Mineral Jarosewichite was named for Eugene Jaroswich (1926-), chief chemist, Department of Mineral Sciences, National Museum of […]
