File:Turquoise (Kingman Mining District, Arizona, USA).jpg

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English: Tuquoise from Arizona, USA. (tumble-polished pieces)

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 5700 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 phosphate minerals all contain one or more phosphate anions (PO4 -3).

Turquoise is a hydrous copper aluminum hydroxy-phosphate mineral, CuAl6(PO4)4(OH)8·4H2O. Long valued as a gemstone, turquoise is a secondary mineral that forms near the surface, usually near copper deposits. The color ranges from bluish to bluish-green to greenish and the hardness is 5 to 6 on the Mohs Scale. Crystals are rare - turquoise usually forms very fine-grained masses.

Locality: unrecorded locality in the Kingman Mining District, Mohave County, northwestern Arizona, USA


Photo gallery of turquoise:

www.mindat.org/gallery.php?min=4060
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Source https://www.flickr.com/photos/47445767@N05/51874404806/
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@N05/51874404806. It was reviewed on 15 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 November 2022

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Date/TimeThumbnailDimensionsUserComment
current16:38, 15 November 2022Thumbnail for version as of 16:38, 15 November 20223,233 × 2,494 (5.77 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51874404806/ with UploadWizard

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