Formula: NaBSi2O5(OH)2 phyllosilicate (sheet silicate)
Specific gravity: 2.46 to 2.49
Colour: White, colourless
Solubility: Readily soluble in hydrochloric acid
Searlesite occurs in boron-bearing evaporite deposits, in sedimentary rocks rich in sodium and potassium, and
in pegmatites, also rich in sodium and potassium.
Common impurities: Al,Fe,Mg,H2O
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