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Category Halide Mineral
Chemical formula KCl
Molar mass 74.55 gm
Color Colorless, Grey, White...
Crystal habit Massive to crystaline
Crystal system Isometric - Hexoctahedral
Cleavage Perfect on the [100], [010], [001]
Fracture uneven
Tenacity Brittle
Mohs scale hardness 2.5
Luster Vitreous
Streak white
Diaphaneity Transparent to Translucent
Density 1.993 g/cm3
Optical properties Isotropic
Refractive index n = 1.4903
Pleochroism Visible in colored crystals
Ultraviolet fluorescence None
References [1][2]

Sylvite 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. [3] 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 n=1.490) [4]. Sylvite has a salty taste with a distinct bitterness.

Sylvite is one of the last evaporite minerals to precipitate out of solution. As such, it is only found in very dry saline areas. Its principal use is as a potassium fertilizer.

Sylvite from Germany

Sylvite is found in many evaporite deposits worldwide. Massive bedded deposits occur in New Mexico and western Texas, and in Utah in the US, but the largest world source is in Saskatchewan, Canada. The vast deposits in Saskatchewan, Canada were formed by the evaporation of a Devonian seaway. Sylvite is the official mineral of Saskatchewan.

Sylvite was first described in 1832 at Mt. Vesuvius near Napoli in Italy and named for the Dutch chemist, François Sylvius de le Boe (1614-1672).

See also


  1. ^ Sylvite: Sylvite mineral information and data
  2. ^ Sylvite Mineral Data
  3. ^ Klein, Cornelis and Cornelius S. Hurlbut, Jr. 1993. Manual of Mineralogy after J.D. Dana, 21st edition. New York: John Wiley & Sons, Inc.
  4. ^ Deer, W.A., R.A. Howie, and J. Zussman. 1992. An Introduction to the Rock-Forming Minerals 2nd ed. New York: Prentice Hall.

External links

Wikisource-logo.svg "Sylvite". Encyclopædia Britannica (11th ed.). 1911.  


1911 encyclopedia

Up to date as of January 14, 2010
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From LoveToKnow 1911

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