Sanakirja.org

(mineralogy) An evaporite, consisting of potassium chloride KCl, also found in fumaroles.

Sylvite – Halide mineral – KCl – Syl – 3.AA.20 – Isometric – Hexoctahedral (m̅3m) – H-M symbol: (4/m m̅3 2/m) – Fm3m – A = 6.2931 Å; Z = 4 – 74.55 g/mol – Colorless to white, pale gray, pale blue; may be yellowish red to red due to hematite inclusions – As cubes and octahedra; columnar, in crusts, coarse granular, massive – Perfect on [100], [010], [001] – Uneven – Brittle to ductile – 2 – Vitreous – White – Transparent to translucent – 1.993 – Isotropic – 1.4903 – Visible in colored crystals – None – Soluble in water – Salty to bitter taste.