Garnet pseudomorph

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This is a large chamosite chlorite pseudomorph after almandine garnet 

A pseudomorph is when one mineral replaces another mineral, but retains the original crystal form. So while this stone looks like a garnet, it has a completely “new” chemical makeup. 

These were called “Black Diamonds” by the miners. These are heavy, as they contain iron. 

Old stock, Collector’s item

459 grams (1 lb)

Locality: Michigamme Mine, Michigamme, Michigan