Harmotome

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Harmotome is a mineral, one of the rarer zeolites; a hydrated barium silicate with formula: (Ba2(Si12Al4)O32·12H2O. 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.

Excerpt from the Wikipedia article “Harmotome”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Robert M. Lavinsky, CC BY-SA 3.0, via Wikimedia Commons.