Orthoclase

Rarity: Rare

A topic known well beyond its field, found in many languages.

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Notion

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Science and technology

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What Wikipedia says

Orthoclase, or orthoclase feldspar (endmember formula KAlSi3O8), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for "straight fracture", because its two cleavage planes are at right angles to each other.

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

Image: Didier Descouens, CC BY-SA 4.0, via Wikimedia Commons.