Ahlfeldite

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What Wikipedia says

Ahlfeldite ((Ni, Co)SeO3]·2H2O) is a mineral of secondary origin. It is named after Friedrich Ahlfeld (1892–1982), a German-Bolivian mining engineer and geologist. Its type locality is Virgen de Surumi mine, Pakajake Canyon, Chayanta Province, Potosí Department, Bolivia.

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

Image: Joan Rosell, from rosellminerals.com, CC BY-SA 4.0, via Wikimedia Commons.