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  Harmotome is a mineral, one of the rarer zeolites; a hydrated barium silicate with formula: (Ba0.5,Ca0.5,Na,K)5Al5,Si11O32·12(H2O). It forms vitreous white well defined monoclinic crystals, often associated with calcite and other zeolites. It has a Mohs hardness of 4 to 5 and a specific gravity of 2.44 to 2.5.

It was first described in 1801 from an occurrence in the Harz Mountains, Lower Saxony, Germany.


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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Harmotome". A list of authors is available in Wikipedia.
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