File:Electrum (Washington State, USA) 1 (17108863329).jpg
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Summary
editDescriptionElectrum (Washington State, USA) 1 (17108863329).jpg |
English: Electrum from Washington State, USA. (Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, 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. Elements are fundamental substances of matter - matter that is composed of the same types of atoms. At present, 118 elements are known (four of them are still unnamed). Of these, 98 occur naturally on Earth (hydrogen to californium). Most of these occur in rocks & minerals, although some occur in very small, trace amounts. Only some elements occur in their native elemental state as minerals. To find a native element in nature, it must be relatively non-reactive and there must be some concentration process. Metallic, semimetallic (metalloid), and nonmetallic elements are known in their native state as minerals. Electrum (AuAg) is an alloy (mix) of elemental gold and silver with >20% Ag. Most “gold” mineral specimens have some silver mixed in as well. Electrum has a metallic luster; ranges in color from silvery to golden yellow, depending on the silver content; has a high specific gravity (it's heavy for its size); has no cleavage; and is malleable. |
Date | |
Source | Electrum (Washington State, USA) 1 |
Author | James St. John |
Licensing
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/17108863329. 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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current | 19:37, 6 May 2015 | ![]() | 1,149 × 1,709 (1.75 MB) | Natuur12 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Date and time of data generation | 15:12, 7 March 2009 |
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File change date and time | 20:05, 27 April 2015 |
Y and C positioning | Co-sited |
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Exif version | 2.21 |
Date and time of digitizing | 15:12, 7 March 2009 |
Meaning of each component |
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Date metadata was last modified | 16:05, 27 April 2015 |
Unique ID of original document | 650F4105CA9221CB20C879F1834895E9 |