Cavansite

Rarity: Common

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Science and technology

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What Wikipedia says

Cavansite, named for its chemical composition of calcium vanadium silicate, is a deep blue hydrous calcium vanadium phyllosilicate mineral, occurring as a secondary mineral in basaltic and andesitic rocks along with a variety of zeolite minerals. Its blue coloring comes from vanadium, a metal ion.

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

Image: No machine-readable author provided. Vsmith assumed (based on copyright claims)., CC BY-SA 3.0, via Wikimedia Commons.