Formula: KLiFe2+Al(AlSi3O10)(F,OH)2 Monoclinic Description:Polylithionite refers to a dark lithium-rich mica, often an unusual brown, found in some granitic pegmatites. “Zinnwaldite” is a technically discredited name that appears in older literature and refers to this mineral.FLORENCE COUNTY: Koehler (1989) …
Florence County
Potassium Feldspar
Formula: KAlSi3O8 Monoclinic or Triclinic Description: Potassium feldspar refers to any of the three polymorphs microcline, orthoclase or sanidine. The distinction between these minerals can be made with certainty only after detailed X-Ray analysis. This has not …
Pyrrhotite
Formula: Fe1-xS Monoclinic Description: Pyrrhotite with pen for scale. From the mineral collection of Brigham Young University Department of Geology, Provo, Utah, Mineral Specimens 867. Courtesy of the U.S. Geological Survey Denver Library Photographic Collection. (Photo by …
Quartz
Formula: SiO2 Hexagonal Description: Quartz is the most abundant mineral. It is an essential component of granitic igneous rocks, of sedimentary rocks such as sandstone and chert and of metamorphic rocks such as quartzites. It is a …
Rhodizite
Formula: (K,Cs)Al4Be4(B,Be)12O28 Isometric Description:Rhodizite is an extremely rare mineral forming colorless, white to yellowish crystals in complex pegmatites.FLORENCE COUNTY: Rhodizite is reported as small euhedral crystals in the “Animikie Red Ace Pegmatite”, most likely the lithium-rich pegmatites exposed …
Sicklerite
Formula: Li(Mn,Fe)PO4 Orthorhombic Description: Sicklerite is a rare yellowish to dark brown phosphate formed as a result of the alteration of other phosphate minerals in granite pegmatites. FLORENCE COUNTY: Sicklerite has been tentatively identified as a coating on …
Siderite
Formula: FeCO3 Hexagonal Description: Siderite forms as a sedimentary precipitate, in hydrothermal veins, in metamorphic rocks formed from such protoliths, and, rarely, in pegmatites. In sedimentary environments it forms in extensive beds of banded iron formations …
Spessartine
Formula: Mn3Al2(SiO4)3 Isometric Description:Spessartine is a member of the garnet family. It is usually red to orange in color and is found generally in granite pegmatites, where it can form large gemmy crystals. It is also found …
Spodumene
Formula: LiAlSi2O6 Monoclinic Description: Spodumene forms large white, pale green or, rarely, pink elongated crystals in complex granitic pegmatites. It is often associated with other lithium-rich minerals. FLORENCE COUNTY: At least three pegmatites in sec. 22 T.39N. …
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 …