Krauskopfite

minerals

macdonaldite

sanbornite

witherite

Formula: BaSi2O5.3H2O
Phyllosilicate (sheet silicate), barium-bearing mineral
Specific gravity: 3.14
Hardness: 4
Streak: White
Colour: Colourless
Solubility: Readily decomposed by cold dilute acids
Common impurities: Ti,Al,Fe,Mn,Mg,Ca,Sr,K
Environments

Metamorphic environments

Krauskopfite occurs in veins cutting sanbornite-quartz bearing gneissic metamorphic rocks. It is a secondary mineral associated with macdonaldite, opal and witherite. It also replaces sanbornite (Dana, Webmin).

Localities

At the type locality is the Esquire No. 1 claim, Rush Creek, Rush Creek deposit, Big Creek-Rush Creek Mining District, Fresno county, California, USA, krauskopfite is typically a vein-forming mineral and is commonly associated with macdonaldite, opal and witherite. The opal and witherite generally form the margin of the veinlets. Veinlets containing krauskopfite have been noted especially in weathered sanbornite-quartz rock where the sanbornite has altered to an opaline substance and pyrrhotite has altered to limonite. In addition to forming veinlets, krauskopfite also occurs as a replacement of sanbornite. Krauskopfite forms grains up to 6 mm long (AM 50.314-340).

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