Sanidine

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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Notion

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Science and technology

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What Wikipedia says

Sanidine is the high temperature form of potassium feldspar with a general formula K(AlSi3O8). Sanidine is found most typically in felsic volcanic rocks such as obsidian, rhyolite and trachyte. Sanidine crystallizes in the monoclinic crystal system. Orthoclase is a monoclinic polymorph stable at lower temperatures.

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

Image: Val Collins, Public domain, via Wikimedia Commons.