Safflorite

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What Wikipedia says

Safflorite is a rare cobalt iron arsenide mineral with the chemical formula (Co,Fe)As2. Pure safflorite is CoAs2, but iron is virtually always present. Safflorite is a member of the three-way substitution series of arsenides known as the loellingite group.

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

Image: Tomasz Praszkier (SpiriferMinerals.com), CC BY 3.0, via Wikimedia Commons.