Phyllosilicate (sheet silicate)
Colour: Colourless to white
Solubility: Decomposed by acids
Common impurities: Al,Fe,Mg,Ca,Sr,H2O
Sanbornite is a major component of barium-silicate assemblages at or near the fringes of large
granite intrusives (Webmin), associated with witherite
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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