Mineralpedia Details for Brandtite

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Brandtite

Named for Swedish chemist George Brandt. Found in metamorphosed iron-manganese and zinc orebodies in localities in Sweden, Germany, Switzerland, the Czech Republic, Kazakhstan, the United States, Chile, and South Africa, among some others. Minerals associated with Brandtite include lead, sarkinite, flinkite, caryopilite, galena, baryte, calcite, rhodochrosite, sphalerite, franklinite, willemite, chalcopyrite, and lollingite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/brandtite.pdf

Formula: Ca₂Mn²⁺(AsO₄)₂·2H₂O
Crystal System: Monoclinic
Crystal Habit: Prismatic, Striated, Radial
Cleavage: Perfect, Good, None
Luster: Vitreous (Glassy)
Color: colorless, white
Streak: white
Class: Monoclinic - Prismatic
Hardness: 3.5
WebMineral: View Brandtite
Mindat: View Brandtite

Brandtite from Harstigen mine, Filipstad, Värmland, Sweden

Special Info: Type Locality

Colorless crude to well-crystallized crystals of the rare arsenate mineral, Brandtite. The crystals are elongated blades from 0.5 to 1mm and radial fans to 3mm.