1) Magnesium mineral
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https://www.crosswordclues.com/clue/epsomite
Epsomite is a hydrous magnesium sulfate mineral with formula MgSO4·7H2O. Epsomite crystallizes in the orthorhombic system as rarely found acicular or fibrous crystals, the normal form is as massive encrustations. It is colorless to white with tints of yellow, green and pink. The Mohs hardness is 2 to 2.5 and it has a low specific gravity of 1.67....
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http://en.wikipedia.org/wiki/Epsomite
• (n.) Native sulphate of magnesia or Epsom salt.
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http://thinkexist.com/dictionary/meaning/epsomite/
a common sulfate mineral, hydrated magnesium sulfate (MgSO47H2O). Its deposits are formed by evaporation of mineral waters, as at Epsom, Surrey, ...
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http://www.britannica.com/eb/a-z/e/38
Ep'som·ite noun Native sulphate of magnesia or Epsom salt.
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http://www.encyclo.co.uk/webster/E/58
Epsomite (popularly known as 'Epsom Salts') is a mineral named after Epsom in Surrey, England where it is found occurring around mineral springs. Although large crystals of epsomite have been found, it is most commonly found as an encrustation or massive aggregate on the surface of other rocks and minerals as a white fibrous mass of acicular micro-...
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http://www.probertencyclopaedia.com/browse/HE.HTM
(Hydrated Magnesium Sulfate) Epsomite, or heptahydrite as it is known in chemistry circles, is one of only a few water soluble sulfate minerals. It is actually well known in most households as the artificially created epsom salt. Magnesium sulfate's medicinal uses were discovered from mineral waters at Epsom, England from where ...
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https://www.encyclo.co.uk/local/23719
the natural form of Epsom salt, MgSO&multiplydot;7HO, found as a crust in caves and lake deposits.
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https://www.infoplease.com/dictionary/epsomite
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