File:Chlorite schist (Michigamme Mine, Upper Peninsula of Michigan, USA).jpg

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English: Chlorite schist from the Precambrian of Michigan, USA. (7.7 centimeters across at its widest)

Chlorite is a common greenish to greenish-gray metamorphic mineral. Actually, chlorite is a group of phyllosilicate minerals, a common example of which is chamosite chlorite: (Fe+2,Mg,Fe+3)5Al(Si3,Al)O10(OH,O)8 - iron magnesium hydroxy-oxy-aluminosilicate. Chlorite is a common constituent of greenstone and various types of schist. It is also a rock-forming mineral. Seen here is a chlorite schist from the Michigamme Mine, an old iron mine in northern Michigan. This material was a waste product. When the mine was active, “black diamonds” in the chlorite schist unit were frustrating to miners - they were so abundant that they frequently damaged the rock-crushing equipment. Michigamme Mine's black diamonds are actually chlorite pseudomorphs after garnet (see elsewhere in this photo album).

Locality: Michigamme Mine, town of Michigamme, Upper Peninsula of Michigan, USA
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Source https://www.flickr.com/photos/47445767@N05/8282176722/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/8282176722 (archive). It was reviewed on 10 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

10 March 2020

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current01:34, 10 March 2020Thumbnail for version as of 01:34, 10 March 2020886 × 720 (701 KB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/8282176722/ with UploadWizard

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