File:Platinum (Russia) 3 (17151299739).jpg
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Summary
[edit]DescriptionPlatinum (Russia) 3 (17151299739).jpg |
Platinum mass & well-formed crystals from Russia. (public display, 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. Platinum (Pt) is far more valuable that gold, but it doesn't have a distinctive, prestigious color. Like most metals, platinum has a silvery color. Platinum, when purified, is heavier than gold, but specimen platinum has about the same specific gravity as gold nuggets (about 19). Platinum is alway found significantly alloyed with other elements, usually other PGEs (platinum-group elements: platinum (Pt), palladium (Pd), osmium (Os), iridium (Ir), rhenium (Re), rhodium (Rh), ruthenium (Ru)). Platinum is typically found in Precambrian ultramafic igneous rocks, but there are also some Pt-bearing placer deposits in Canada, Colombia, and Russia. |
Date | |
Source | Platinum (Russia) 3 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/17151299739. 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 | 19:27, 6 May 2015 | ![]() | 2,791 × 1,604 (3.25 MB) | Natuur12 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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File change date and time | 20:50, 1 May 2015 |
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Date and time of digitizing | 13:30, 17 November 2012 |
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