File:Wulfenite (Red Cloud Mine, La Paz County, Arizona, USA) 2 (16738499943).jpg

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Wulfenite crystals from Arizona, 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. Minor categories include vanadates, molybdates, chromates, arsenates, borates, tungstates, and oxalates.

Wulfenite is an attractive molybdate mineral having a shiny nonmetallic luster, an orangish color, and distinctive rectangular tabular crystals. Wulfenite is lead molybdate (PbMoO4). The lead content makes it noticeably heavy for its size.

Locality: Red Cloud Mine, La Paz County, Arizona, USA
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Source Wulfenite (Red Cloud Mine, La Paz County, Arizona, 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@N05/16738499943. 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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current19:15, 6 May 2015Thumbnail for version as of 19:15, 6 May 20152,484 × 1,936 (3.34 MB)Natuur12 (talk | contribs)Transferred from Flickr via Flickr2Commons

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