Magnesium Iron Silicate Hydroxide is Cummingtonite

Twitter can be an amazing time waster, and it can also lead to fascinating new tidbits of information.

Cummingtonite has the chemical formula (Mg,Fe)7Si8O22(OH)2, is classed as an isosilicate or chain silicate; minerals composed of interlocking chains of silicate tetrahedra. The mineral was first discovered in 1824 near the town of Cummington Mass. A disappointing etymology for a terrifically named mineral.

Fibrous, brownish crystals of cummingtonite from Sweden

 

Cummingtonite from South Dakota

Cummingtonite from New Zealand

Cummingtonite around the world.

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