Formula: Cu2(CO3)(OH2) Monoclinic Description: Malachite is a common alteration product of other copper-bearing minerals. Its bright green color makes it not only easily recognized, but also highly sought after by mineral collectors. It occurs most notable …
Rusk County
Marcasite
Formula: FeS2 Orthorhombic Description: Marcasite helectite, New Diggings area, Lafayette County, Wisconsin. Sample is about 8 cm long. (Photo by W. Cordua.) Marcasite is common in Wisconsin, often found in well-formed crystals in cavities and veins in the …
Metavivianite
Formula: Fe3(PO4)2(OH)2.6H2O Triclinic Description: Metavivianite is a rare phosphate mineral formed by the alteration of vivianite and other phosphate minerals. RUSK COUNTY: Forms dark to pale green crystals and coating on vivianite from the oxidized zone, Flambeau …
Muscovite
Formula: KAl2(AlSi3)O10(OH,F)2 Monoclinic Description:Muscovite is a common mica, forming silvery to pale-colored flakes most commonly schists and granite pegmatites. It can survive weathering, and form sparkling grains in sands and sandstone. Muscovite. From the mineral collection of …
Olivine
Formula: (Mg,Fe)2SiO4 Orthorhombic Description: Olivine is here used to refer to a solid solution series of minerals ranging from the magnesium end member (forsterite) to the iron end member (fayalite). Olivine is widespread in basalts and gabbros, …
Osarizawaite
Formula: Pb(AlCu)3(SO4)2(OH)6 Hexagonal Description: Osarizawaite is a rare secondary mineral found in the zone of oxidized over lead-bearing deposits. RUSK COUNTY: Osarizawaite occurs in the oxidized zone at the Flambeau Mine, near Ladysmith (Jones, Jones, and LaBerge, 1999).
Petzite
Formula: Ag3AuTe2 Isometric Description: Petzite is a steel-gray granular mineral found in hydrothermal deposits associated with other rare tellurium, gold and silver minerals. RUSK COUNTY: Petzite is reported as a component of the ore at the Flambeau Mine, …
Plumbogummite
Formula: PbAl3(PO4)2(OH)5.H2O Hexagonal Description: Plumbogummite is a rare secondary mineral found in the oxidized zone over lead-bearing deposits. RUSK COUNTY: Plumbogummite occurs in the oxidized zone at the Flambeau Mine, near Ladysmith (Jones, Jones, and LaBerge, 1999). …
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 …
Pseudomalachite
Formula: Cu5(PO4)2(OH)4 Monoclinic Description: Pseudomalachite is a green hydrated copper phosphate formed as a secondary mineral in the oxidized zone of copper deposits. RUSK COUNTY: Pseudomalachite occurs as rare masses and spherical rosettes of drusy crystals in the …