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.
Cummingtonite around the world.