Cummingtonite is a
mineral (
Big Science version of the name -
Magnesium Iron Silicate Hydroxide) with the
chemical formula (Mg, Fe)
7Si
8O
22(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.
Information direct from http://www.galleries.com/minerals/ :
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.