
1) Mineral
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https://www.crosswordclues.com/clue/kieserite

Kieserite is the magnesium sulfate mineral (MgSO4·H2O) and is named after Dietrich Georg von Kieser (Jena, Germany 1862). It has a vitreous luster and it is colorless, grayish-white or yellowish. Its hardness is 3.5 and it has a monoclinic crystal system. It is used in the production of Epsom salt and as a fertiliser, the overall global annual us...
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http://en.wikipedia.org/wiki/Kieserite

• (n.) Hydrous sulphate of magnesia found at the salt mines of Stassfurt, Prussian Saxony.
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http://thinkexist.com/dictionary/meaning/kieserite/

(from the article `magnesium`) Magnesium sulfate, MgSO4, is a colourless, crystalline substance formed by the reaction of magnesium hydroxide with sulfur dioxide and air. A hydrate ...
Found on
http://www.britannica.com/eb/a-z/k/30
Kie'ser·ite noun [ Named after Prof.
Kieser , of Jena.]
(Min.) Hydrous sulphate of magnesia found at the salt mines of Stassfurt, Prussian Saxony.
Found on
http://www.encyclo.co.uk/webster/K/8

Kieserite, named after Professor Kieser, of Jena, is a hydrous sulphate of magnesia found at the salt mines of Stassfurt, Prussian Saxony. Kieserite is employed as a source of epsom salt, and in the manufacture of manures. Mixed with quicklime and water it hardens into a mass which, after heating, pulverizing, and again mixing with water, becomes o...
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http://www.probertencyclopaedia.com/browse/HK.HTM

Magnesium sulfate
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http://www.translationdirectory.com/glossaries/glossary075.htm

[
n] - a white mineral consisting of hydrous magnesium sulfate often found in salt mines
Found on
http://www.webdictionary.co.uk/definition.php?query=kieserite

a mineral, hydrous magnesium sulfate, MgSO&multiplydot;HO, having a white or yellowish color and found with salt deposits.
Found on
https://www.infoplease.com/dictionary/kieserite
No exact match found.