Formula: Ta2O5 Triclinic Description: Tantite is a rare mineral found as colorless lustrous grains with other tantalum-bearing minerals in granite pegmatites. FLORENCE COUNTY: Tantite occurs in the contact zone of the Animikie Red Ace complex pegmatite in sec. …
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Tanteuxinite-(Y)
Formula: (Y,Ce,Ca)(Ta,Ti,Nb)2(O,OH)6 Orthorhombic Description: Tanteuxinite-(Y) forms brownish black resinous crystals and masses in granite pegmatites and placer deposits derived from them. MARATHON COUNTY: Tanteuxinite was identified from pegmatites in the Koss pit, a rotten granite quarry several miles …
Talc
Formula: Mg3Si4O10(OH)2 Triclinic Description: Talc with pen for scale. From the mineral collection of Brigham Young University Department of Geology, Provo, Utah, Mineral Specimens 1073. Courtesy of the U.S. Geological Survey Denver Library Photographic Collection. (Photo by Andrew …
Svanbergite
Formula: SrAl3(PO4)(SO4)(OH)6 Hexagonal Description: Svanbergite forms as a result of medium-grade metamorphism of aluminum-rich sediments.. SAUK COUNTY: Microscopic grains of svanbergite occur in metapelite layers within the Baraboo Quartzite where it is associated with pyrophyllite, quartz, hematite, and …
Sulfur
Formula: S Orthorhombic Description: Sulfur. From the Bureau of Mines, Mineral Specimens C\01732, courtesy of the U.S. Geological Survey Denver Library Photographic Collection. Sulfur forms around volcanic fumaroles, in sedimentary rocks as a result of bacterial …
Strontianite
Formula: SrCO3 Orthorhombic Description: Strontianite forms white acicular to prismatic crystals. It is found as low temperature hydrothermal mineral and a ground water precipitate, primarily in carbonate sedimentary rocks. LAFAYETTE COUNTY: Radiating crystals on limestone were reported from …
Stolzite/Raspite
Formula: Pb(WO)4 Tetragonal/ monoclinic Description: Stolzite and raspite are dimorphs are formed by the oxidation of other tungsten-bearing minerals. MARATHON COUNTY: Stolzite/Raspite has been found as microscopic grains in ferberite/hubnerite in the McGuire Pit, part of the LaDick …
Stilpnomelane
Formula: (K,Ca,Na)(Fe, Mg,Al)8(Si,Al)12(O,OH)36.nH2O Triclinic Description: Stilpnomelane is a brown micaceous to velvety to fibrous mineral found in various metamorphic rocks, especially those rich in iron. It often occurs with chlorite, epidote, magnetite, hematite and goethite and …
Stibiotantalite
Formula: Sb(Ta, Nb)O4 Orthorhombic Description: Stibiotantalite is a rare mineral forming dark brown, yellow brown or reddish brown tabular crystals in complex granite pegmatites. FLORENCE COUNTY: Falster (1992, personal communication) reports stibiotantalite as occurring in the complex pegmatites …
Stibiconite
Formula: Sb3O6(OH) Orthorhombic Description: Stibiconite is a white to yellowish mineral that forms as a result of the alteration of other antimony-rich minerals, such as stibnite. MARATHON COUNTY: Falster( 1987) reports stibiconite as white crusts on sulfosalts …