Saponite

Saponite is a monoclinic mineral of the montmorillonite group. Its chemical formula is (½Ca,Na)_0.33(Mg,Fe⁺²)₃(Si,Al)₄O₁₀(OH)₂·4H₂O.

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It is soft, massive, and plastic, and exists in veins and cavities in serpentinite and basalt. The name is derived from the Greek sapo, soap. Other names include bowlingite; mountain soap; piotine; soapstone.

References

• Mindat.org
• Webmineral.com

This article contains material from the U.S. Bureau of Mines Dictionary of Mining, Mineral, and Related Terms.