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Mineralpedia Details for Walentaite

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Walentaite

Walentaite

Walentaite, named for Dr. Kurt Walenta, major contributor to the mineralogy of arsenates and phosphates and a Professor of Mineralogy at the University of Suttgart in Suttgart, Germany, finds its type locality from the White Elephant mine here in the Black Hills of South Dakota, USA. Found in few localities, Walentaite is a rare secondary mineral, found at the White Elephant mine as an alteration product of lollingite and triphylite-lithiophilite, and at the Griffin’s Find mine in Australia in the oxidixed zone of a gold deposit.

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

Formula
H2Ca2Fe3+6(AsO4)5(PO4)3ยท14H2
Crystal System
Orthorhombic 
Crystal Habit
Rosette 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
greenish yellow, yellow green, bright yellow 
Streak
yellow 
Class
Orthorhombic 
Hardness
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Mindat
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Walentaite from White Elephant mine, Custer Co., South Dakota, United States

Walentaite
            from White Elephant mine, Custer Co., South Dakota, United States

Greenish yellow, flat lying radial sprays of acicular crystals to about 0.75mm in diameter on Quartz.

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