Celsian

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What Wikipedia says

Celsian is an uncommon feldspar mineral, barium aluminosilicate, BaAl2Si2O8. The mineral occurs in contact metamorphic rocks with significant barium content. Its crystal system is monoclinic, and it is white, yellow, or transparent in appearance. In pure form, it is transparent.

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

Image: Astynax, Public domain, via Wikimedia Commons.