Formula: Mn2+Na8(Ca4Na4)(Mn2+Fe2+)43(PO4)36 Monoclinic Description: Fillowite is a rare mineral found as yellowish to reddish brown granular masses in complex granitic pegmatites. FLORENCE COUNTY: Fillowite is a component of light brown to tan nodules in the complex pegmatites in …
Florence County
Glaucophane
Formula: Na2(Mg3Al2)Si8O22(OH)2 . Monoclinic Description: Glaucophane is a blue member of the amphibole group that forms in metamorphic rocks that are either particularly rich in sodium or that have experienced low temperature-high pressure metamorphism such as would …
Graphite
Formula: C Hexagonal Description: Graphite with U.S. quarter for scale. From the mineral collection of Brigham Young University Department of Geology, Provo, Utah, Mineral Specimens 589. (Image courtesy U.S. Geological Survey Denver Library Photographic Collection; …
Grunerite
Formula: (Fe,Mg)7Si8O22(OH)2 Monoclinic Description: Grunerite is a member of the amphibole family. It occurs in relatively iron-rich rocks that have been subjected to moderate grades of metamorphism. ASHLAND COUNTY: Grunerite is a widespread contact metamorphic minerals in the …
Hambergite
Formula: Be2BO3(OH) Orthorhombic Description: Hambergite is a clear to white vitreous mineral found in certain complex pegmatites. FLORENCE COUNTY: Hambergite is reported from the complex pegmatite dikes in T.39N. R.17E., near Fern (Falster, 1992, personal communication).
Hematite
Formula: Fe2O3 Hexagonal Description: “Needle Ore” hematite, longest needle is about 20 cm long. From Montreal Mine in Iron County, Wisconsin. (Image courtesy W. S. Cordua.) Hematite is an extremely common mineral. It can form as a …
Heterosite-purpurite
Formula: (Fe,Mn)PO4 Orthorhombic Description: Heterosite-purpurite represents a simple solid solution mineral found masses in complex granite pegmatites in association with other phosphates. FLORENCE COUNTY: Heterosite-purpurite nodules up to 5 cm. across occur in the zoned pegmatites in sec. …
Hornblende
Formula: (Ca,Na)(Mg,Fe)4Al(Si7Al)O22(OH,F)2 Monoclinic Description: Hornblende as a mineral name has been recently discredited. Here it is used as a field name for any dark amphibole for which the exact composition has not been determined. In the past …
Huttonite
Formula: ThSiO4 Monoclinic Description: Huttonite is a rare colorless to white adamantine mineral found in certain complex pegmatites and associated placer deposits. FLORENCE COUNTY: Huttonite is reported from the complex pegmatite dikes in T.39N. R.17E., near Fern (Falster, …
Kyanite
Formula: Al2SiO5 Triclinic Description: Kyanite schist outcrop near Powell in Iron County, Wisconsin. (Photo courtesy Tod Roush.) Kyanite is formed by the metamorphism of aluminum-rich rocks, and is often associated with biotite, muscovite, almandine, staurolite, and sillimanite. It …