Cummingtonite is a mineral (Big Science version of the name - Magnesium Iron Silicate Hydroxide) with the chemical formula (Mg, Fe)7Si8O22(OH)2. It's the middle member of the Cummingtonite series of minerals, between the minerals grunerite and magnesiocummingtonite. The three are differentiated by iron to magnesium ratios.

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Cummingtonite has what is quite possibly the silliest, rudest, most mind-bendingly sophomoric name ever attached to a stupid rock. Sure, it's named after the town it was first found in (Cummington, Massachussets), but if your sense of humor likes to roll about in the gutter (and, boy, does mine ever!) you'll do well to work this into as many discussions as you can. Me, I'm gonna put a chunk on my coffee table. Conversation piece, you see.

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