File:Binghamite (Cuyuna North Range, Minnesota, USA).jpg

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Binghamite from the Precambrian of Minnesota, USA. (public display, Minnesota Discovery Center, Chisholm, Minnesota, USA)

Binghamite has been characterized as a mineral, or as a variety of quartz, but it is not. Binghamite is a rock having chalcedony (= microscopic fibrous quartz) intergrown with fibrous iron oxide - hematite and/or goethite. Some sources say that binghamite is chalcedony replacement of fibrous goethite-hematite. This material has chatoyancy - the same play of light and color as seen in tiger's eye quartz, which also has a fibrous structure. Apparent synonyms, or near-synonyms, of binghamite include silkstone and cuyunite.

Locality: iron mine in the Cuyuna North Range (probably near the town of Crosby), Crow Wing County, central Minnesota, USA
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Source Binghamite (Cuyuna North Range, Minnesota, USA) 5
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/22917986494. It was reviewed on 29 December 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

29 December 2015

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current06:44, 29 December 2015Thumbnail for version as of 06:44, 29 December 20154,000 × 3,000 (3.84 MB)Tillman (talk | contribs)Transferred from Flickr via Flickr2Commons

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