Chamosite ("Thuringite") pseudomorph after Almandine

Michigamme Mine, Michigamme, Marquette iron range, Marquette County, Michigan
Thumbnail, 2.8 x 2.1 x 1.7 cm
Start Time: 06/07/2018 6:45:00 pm (CDT)
End Time: 06/14/2018 6:45:00 pm (CDT)
Auction Closed

Item Description

Thuringite is an outdated name for the ferroan variety of Chamosite, a Chlorite Group mineral. Here we have a good sized, sharp, fairly lustrous, textbook dodecahedral Almandine garnet crystal that has been pseudomorphed by silvery black Chamosite. This is a classic material from the old iron mines of Marquette County. Rare and excellent historic material. I'm told that this material is also magnetic, but I couldn't get it to react to a magnet here at the office, so maybe it's only slightly magnetic.

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