Borax

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What Wikipedia says

Borax (Na2B4O5(OH)4 · 8 H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments and as a surface efflorescence in arid regions. It is the chief mineral mined from the deposits at Boron, California and nearby locations, and is the chief source of commercial borax.

Excerpt from the Wikipedia article “Borax (mineral)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Aram Dulyan (User:Aramgutang), Public domain, via Wikimedia Commons.