File:Vivianite on phosphorite (Meade Peak Member, Phosphoria Formation, Permian; Astoria Hot Springs roadcut, Teton County, Wyoming, USA) 1 (49191702513).jpg

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Vivianite on phosphorite in the Permian of Wyoming, USA.

A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5500 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.

The sulfate minerals all contain one or more sulfate anions (SO4-2).

Vivianite is a blue-colored, hydrous iron phosphate mineral: Fe3(PO4)2·8H2O. The sample seen here is a talus piece of black phosphorite. Exposure at the surface has liberated some phosphorus, resulting in a bluish vivianite weathering film.

Stratigraphy: float from the Meade Peak Member, Phosphoria Formation, Permian

Locality: roadcut on the northern side of Route 26/Route 89 at the town of Astoria Hot Springs, Snake River Canyon, southern Teton County, northwestern Wyoming, USA

Photo gallery of vivianite:

<a href="https://www.mindat.org/gallery.php?min= 4194" rel="noreferrer nofollow">www.mindat.org/gallery.php?min= 4194 </a>
Date
Source Vivianite on phosphorite (Meade Peak Member, Phosphoria Formation, Permian; Astoria Hot Springs roadcut, Teton County, Wyoming, USA) 1
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@N05/49191702513 (archive). It was reviewed on 10 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

10 December 2019

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current01:37, 10 December 2019Thumbnail for version as of 01:37, 10 December 20192,979 × 2,542 (6.21 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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