Formula: CaSO4.2H2O Monoclinic Description: Gypsum is a relatively common mineral in a number of environments. It is found in sedimentary rocks, either as a primary precipitate from sea or saline lake waters or as a alteration …
Rusk County
Halotrichite
Formula: FeAl2(SO4)4.22H2O MONOCLINIC Description: Halotrichite usually forms as crusts on sulfide minerals during weathering. It is a water soluble mineral that does not survive long in Wisconsin’s climate. RUSK COUNTY: White fibrous crystals of halotrichite were abundant …
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 …
Hessite
Formula: Ag2Te Monoclinic Description: Hessite is a silver telluride forming masses or pseudo-cubic crystals in hydrothermal deposits. RUSK COUNTY: Hessite was reported as tiny grains intergrown with other sulfides in the primary ore at the Flambeau Copper …
Hidalgoite
Formula: PbAl3(AsO4)(SO4)(OH)6 Hexagonal Description: Hidalgoite is a rare secondary mineral found in the zone of oxidized over lead-bearing deposits. RUSK COUNTY: Hidalgoite occurs in the oxidized zone at the Flambeau Mine, near Ladysmith. (Jones, Jones, and LaBerge, 1999).
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 …
Illite
Formula: K0.65Al2(AlSi)4O10(OH)2 Monoclinic Description: Illite refers to a group of clay minerals formed by weathering or hydrothermal alteration of other aluminum-rich minerals. It occurs intermixed with kaolin and other clay minerals. Its identification requires X-Ray analysis. …
Kemmlitzite
Formula: (Sr,Ce)Al3(AsO4)(SO4)(OH)6 Hexagonal Description: Kemmlitzite is a rare secondary mineral found in the zone of oxidized over sulfide-rich ore deposits. RUSK COUNTY: Kemmlitzite occurs in the oxidized zone at the Flambeau Mine, near Ladysmith (Jones, Jones, and LaBerge, …
Kolbeckite
Formula: ScPO4.2H2O Monoclinic Description: Kolbeckite is a rare phosphate found with other phosphate minerals in hydrothermal veins or in variscite nodules. RUSK COUNTY: Kolbeckite was found as lime green micro-xls on sooty chalcocite in the Flambeau copper …
Leucophosphite
Formula: KFe2(PO4)2(OH).2H2O Monoclinic Description: Leucophosphite is a rare phosphate mineral found with other phosphate minerals in diverse environments. RUSK COUNTY: Leucophosphite occurs as microscopic pale brown platey crystals and crystal rosettes in oxidized ore at the Flambeau …