1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
SYLVITE, a mineral consisting of potassium chloride (KC1), first observed in 1823, as an encrustation on Vesuvian lava. Well-formed crystals were subsequently found in the salt deposits of Stassfurt in Prussia and Kalusz in Austrian Galicia. It crystallizes in the cubic system with the form of cubes and cubooctahedra and possesses perfect cleavages parallel to the faces of the cube. Although the crystals are very similar in appearance to crystals of common salt, they are proved by etching experiments to possess a d…
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- Vol. 26, pp. 284-284