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Related to sylvite: potash


see potassium chloridepotassium chloride,
chemical compound, KCl, a colorless or white, cubic, crystalline compound that closely resembles common salt (sodium chloride). It is soluble in water, alcohol, and alkalies.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a mineral of the halide class with chemical composition KC1. It contains 52.48 percent K and admixtures of Br and, less frequently, I. Occluded gas bubbles (N2, CO2, CH4, He) impart a milky white color to transparent and colorless sylvite crystals. Sylvite also contains admixtures of halite (NaCl) and ferric oxide (Fe2 O3), the latter giving the mineral a red color.

Sylvite crystallizes in the isometric system. Distinct well-cut crystals are rare. Sylvite usually forms compact granular masses with, for example, halite and carnallite (similar aggregates are called sylvinite). Sylvite has a hardness of 2 on Mohs scale, a density of 1,990 kg/m3, and a vitreous, dull luster. It dissolves freely in water andhas a burning, bitter salty taste. Transparent crystals exhibit good transmission of radiation in the shortwave and infrared regions of the spectrum.

Sylvite naturally occurs in sedimentary salt-bearing rock strata together with halite and carnallite, sometimes forming large strata in the commercial deposits of potassium salts. It also occurs as a sublimation product of volcanic fumes. Artificial transparent sylvite crystals are used in the optical systems of spectrographs and other devices.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


KCl A salty-tasting, white or colorless isometric mineral, occurring in cubes or crystalline masses or as a saline residue; the chief ore of potassium. Also known as leopoldite; sylvine.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
1 Whewellite Ca, K, Mg 2 Calcite Ca, K, Mg 3 Whewellite Ca, K, Mg 4 Calcite Ca, K, Mg 5 Whewellite Ca, K, Mg, Na 6 Calcite, sylvite Ca, K, Mg, Na 7 Calcite, kaolinite Ca, Mg 8 Sylvite, quartz, calcite Ca, K, Mg, Na 9 Sylvite, quartz, calcite Ca, K, Mg, Na 10 Sylvite, quartz, calcite, kaolinite, albite Ca, K, Mg, Na 11 Sylvite, quartz, calcite, kaolinite, albite Ca, K, Mg, Na 12 n.d.
The peaks of quartz, microcline, and illite from the MK and of quartz, calcite, and sylvite from the OPA were observed to have almost disappeared, indicating a degree of geopolymerization.
This includes higher grade Sylvite mineralisation of 130.39Mt @ 27.02% KCl (total contained potash of 35Mt).
The purpose of the work was to determine the best conditions of reaction for the production of crystals of potassium sulphate from phosphogypsum and sylvite in aqueous ammonia.
The L2-type fluid inclusions contain a dominant aqueous phase and a small vapour phase (Rv = 30% on average) and contain several (n > 2) crystals of salts, including halite and possibly sylvite (Figure 6(c)).
It is made up of an intimate mixture of sylvite, halite, some carnallite and various minor impurities.
Easy to recognize by their velocities, in some wells even sylvite has been described, although has no match to the gamma ray log readings.
These are harvested and trucked to the potash plant where they are ground to liberation, mixed with brine, froth rotated, and partially dried to produce a 95% KCl sylvite product.
However, this observation of abundant daughter minerals of FIs in the prograde skarn stage was rarely documented in other skarn or porphyry Cu-Mo deposits, such as only halite + opaque daughter minerals which occur in the porphyry Cu-Mo deposit at Butte [47] and halite + sylvite + opaque Fe-bearing daughter minerals in the Hongniu-Hongshan skarn Cu deposit [48].
The peaks at 3.63, 3.15, 2.22, and 1.82 [Angstrom] were attributed to the presence of sylvite (KCl) and indicated sylvite in biochars from straws of wheat, rice, corn, soybean, peanut, faba bean, and pea.