Sanbornite

minerals

witherite

taramellite

gillespite

Formula: BaSi2O5
Phyllosilicate (sheet silicate)
Specific gravity:
Hardness: 5
Streak: White
Colour: Colourless to white
Solubility: Decomposed by acids
Common impurities: Al,Fe,Mg,Ca,Sr,H2O
Environments

Metamorphic environments

Sanbornite is a major component of barium-silicate assemblages at or near the fringes of large granite intrusives (Webmin), associated with witherite and taramellite (Dana).

Localities

At the Gun claim, Wilson Lake, Itsi Mountain, Watson Lake mining district, Yukon, Canada, sanbornite is associated with gillespite, pellyite, taramellite, fresnoite, muirite and baryte (HOM).

At the type locality, the Trumbull Peak barium-silicate deposit, Trumbull Peak, Clearing House, Clearing House Mining District, East Belt, Mariposa county, California, USA, sanbornite occurs in veins in metamorphosed sediments, largely quartzite and hornfels. Associated minerals include quartz, gillespite, diopside, schorl, celsian, pyrrhotite and witherite (HOM).

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