Properties
| Category | Halide mineral |
|---|---|
| Formula | KCl |
| Crystal system | Isometric |
| Color | Colorless to white, pale gray, pale blue; may be yellowish red to red due to hematite inclusions |
| Crystal habit | As cubes and octahedra; columnar, in crusts, coarse granular, massive |
| Cleavage | Perfect on , , |
| Fracture | Uneven |
| Tenacity | Brittle to ductile |
| Mohs scale hardness | 2 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 1.993 |
From the Wikipedia article
Sylvite, or sylvine, is potassium chloride (KCl) in natural mineral form. It forms crystals in the isometric system very similar to normal rock salt, halite (NaCl). The two are, in fact, isomorphous. Sylvite is colorless to white with shades of yellow and red due to inclusions. It has a Mohs hardness of 2.5 and a specific gravity of 1.99. It has a refractive index of 1.4903. Sylvite has a salty taste with a distinct bitterness.
Source
Source record: crystal-compendium/sylvite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Sylvite — revision id 1267331374. Text and properties from Wikipedia, licensed CC BY-SA 4.0.