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Bigcreekite: BaSi2O5·4(H2O) Gillespite: BaFe++Si4O10 Sanbornite: BaSi2O5
Comments: Tiny white, spherical patterns, halo-like crystals of bigcreekite to about 0.5mm and reddish gillespite in a matrix of pale yellowish sanbornite. Location: Trumbull Peak, Mariposa Co., California, United States. Scale: 2.5 x 2 x 2cm. © Tom Loomis / Dakota Matrix