Searlesite

phyllosilicate

evaporite

Formula: NaBSi2O5(OH)2 phyllosilicate (sheet silicate)
Specific gravity: 2.46 to 2.49
Hardness: 3½
Streak: White
Colour: White, colourless
Solubility: Readily soluble in hydrochloric acid
Environments:

Pegmatites
Sedimentary environments

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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