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File:Pyromorphite (Bunker Hill Mine, Idaho, USA) 2 (17172613329).jpg

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Pyromorphite from Idaho, USA. (Cranbrook Institute of Science specimen, Bloomfield Hills, Michigan, USA)

A mineral is a naturally-occurring, solid, inorganic, crystalline substrance 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 4900 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 have one or more phosphate anions (PO4-3).

Pyromorphite is a lead chlorophosphate mineral (Pb5(PO4)3Cl). Where well-developed, it forms hexagonal crystals, and can occur in several different colors. Pyromorphite is a secondary mineral found in the supergene zone of lead-rich areas.

Locality: Bunker Hill Mine, Idaho, USA
Date
Source Pyromorphite (Bunker Hill Mine, Idaho, USA) 2
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/17172613329. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2015

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