File:Gold nugget (placer gold) 1 (17001285916).jpg
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DescriptionGold nugget (placer gold) 1 (17001285916).jpg |
English: Gold nugget (placer gold) (12 mm across at the widest). The gold sample shown above is a natural nugget from a placer deposit.
Gold is a metal. Metallic, semimetallic (metalloid), and nonmetallic elements are known in their native state as minerals. 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. As of the year 2018, there are around 4500 named and described terrestrial 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). Gold is a native element in nature. To find a native element, it must be relatively non-reactive and there must be some concentration process. 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. Gold is very rare in crustal rocks - it averages about 5 ppb (parts per billion). Where gold has been concentrated, it occurs as wires, dendritic crystals, twisted sheets, octahedral crystals, and variably-shaped nuggets. It most commonly occurs in hydrothermal quartz veins, disseminated in some contact- & hydrothermal-metamorphic rocks, and in placer deposits. Placers are concentrations of heavy minerals in stream gravels or in cracks on bedrock-floored streams. Gold has a high specific gravity (about 19), so it easily accumulates in placer deposits. Its high density allows prospectors to readily collect placer gold by panning. Gold (Au) is the most prestigious metal known, but it's not the most valuable. Gold is the only metal that has a deep, rich, metallic yellow color. |
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Source | https://www.flickr.com/photos/jsjgeology/17001285916/ (James St. John @ flikr) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/17001285916. It was reviewed on 6 April 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 April 2015
Riferimento (Reference) edit
www-acc.esa.int European Space Agency 2018
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current | 20:34, 6 April 2015 | 1,165 × 920 (1.47 MB) | Jacopo Werther (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 2,400 dpi |
Vertical resolution | 2,400 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 02:25, 4 April 2015 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | 9808BE25A53B4821973177025700A53C |
Date and time of digitizing | 22:21, 3 April 2015 |
Date metadata was last modified | 22:25, 3 April 2015 |