Gyrolite

Rarity: Common

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What Wikipedia says

Gyrolite, NaCa16(Si23Al)O60(OH)8·14H2O, is a rare silicate mineral (basic sodium calcium silicate hydrate: N-C-S-H, in cement chemist notation) belonging to the class of phyllosilicates. Gyrolite is also often associated with zeolites.

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

Image: Ivar Leidus, CC BY-SA 4.0, via Wikimedia Commons.