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Mineralpedia Details for Gonyerite

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Gonyerite

Gonyerite

Named for Forest A. Gonyer, an analytical chemist in the Department of Mineralogy and Petrography at Harvard University in Massachusetts, USA. Gonyerite is a rare mineral that gets its type locality from Langban, Sweden, and has additional localities in South Africa, the United States, Norway, Italy, and Germany. Gonyerite occurs in hydrothermal veins through skarn.

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

Formula
Mn2+5Fe3+(Si3Fe3+)O10(OH)8 
Crystal System
Orthorhombic 
Crystal Habit
Radial, Platy 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
dark brown, brownish black, bright green 
Streak
chocolate brown 
Class
Orthorhombic 
Fracture
Flexible 
Hardness
2.5 
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Gonyerite from Långban, Filipstad, Värmland, Sweden

Gonyerite
            from Långban, Filipstad, Värmland, Sweden

Dark brown or bronze colored rosettes as silky looking radiating sprays to 5mm in diameter.

Deep reddish, platy crystals to 2mm in radial patterns in matrix.

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