File:Gold nugget (placer gold) 1 (17001285916).jpg
原始文件 (1,165 × 920像素,文件大小:1.47 MB,MIME类型:image/jpeg)
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摘要[编辑]
描述Gold 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. |
日期 | |
来源 | https://www.flickr.com/photos/jsjgeology/17001285916/ (James St. John @ flikr) |
作者 | James St. John |
许可协议[编辑]
这幅图片原始出处为Flickr的https://www.flickr.com/photos/47445767@N05/17001285916 ,作者为jsj1771 。经机器人FlickreviewR在2015年4月6日审查后确定为采用cc-by-2.0的协议授权使用。 |
2015年4月6日
Riferimento (Reference)[编辑]
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宽度 | 1,295 px |
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高度 | 1,028 px |
每部件位数 |
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像素构成 | RGB |
方位 | 标准 |
像素数 | 3 |
水平分辨率 | 2,400 dpi |
垂直分辨率 | 2,400 dpi |
使用软件 | Adobe Photoshop Elements 13.0 (Macintosh) |
文件修改日期时间 | 2015年4月4日 (六) 02:25 |
Exif版本 | 2.21 |
色彩空间 | sRGB |
原始文件唯一ID | 9808BE25A53B4821973177025700A53C |
数字化日期时间 | 2015年4月3日 (五) 22:21 |
原始数据最后修改日期 | 2015年4月3日 (五) 22:25 |