in natural mineral
form. It forms crystals
in the isometric
similar to normal rock salt
). (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 n=1.490) . Sylvite has a salty taste with a
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
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.
deposits in Saskatchewan, Canada were formed
by the evaporation of a Devonian
Sylvite is the official mineral of
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).
- Klein, Cornelis and Cornelius S. Hurlbut, Jr. 1993. Manual
of Mineralogy after J.D. Dana, 21st edition. New York:
John Wiley & Sons, Inc.
- Deer, W.A., R.A. Howie, and J. Zussman. 1992. An
Introduction to the Rock-Forming Minerals 2nd ed. New York: