File:Blue halite (Prairie Evaporite Formation, Middle Devonian; Potash Saskatchewan-Lanigan Mine, Saskatchewan, Canada) (32237025735).jpg
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[編輯]描述Blue halite (Prairie Evaporite Formation, Middle Devonian; Potash Saskatchewan-Lanigan Mine, Saskatchewan, Canada) (32237025735).jpg |
Blue halite from the Devonian of Canada. (Left: 2.6 cm across; right: 2.9 cm across) 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. Currently, there are over 5500 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. The halides are the "salt minerals", and have one or more of the following anions: Cl-, F-, I-, Br-. Halite is true salt, which consists of sodium chloride (NaCl). This is the same chemical long used as flavoring on food & as a preservative. It has a nonmetallic luster, typically clearish/coloress, and is relatively soft (H = 2.5). Halite forms cubic crystals and has cubic cleavage (= 3 cleavage planes meeting at 90º angles). Halite is most readily identified by its strongly salty taste. Halite has economic value. In addition to its use in food, salt is traditionally used in large quantities in wintertime to prevent roadways from icing up. Halite is principally mined from ancient rock salt successions. Rock salt is a chemical sedimentary rock composed of halite and formed by evaporation of seawater. The blue coloration in the halite shown above is the result of radiation from potassium-40 in nearby "potash" salts (= sylvite). Irradiation ultimately results in excess free sodium metal in the halite, turning it blue. Stratigraphy: Prairie Evaporite Formation, upper Elk Point Group, Middle Devonian Locality: Potash Saskatchewan-Lanigan Mine (PCS-Lanigan Mine), near the town of Lanigan, south-central Saskatchewan, Canada Photo gallery of halite: <a href="http://www.mindat.org/gallery.php?min=1804" rel="noreferrer nofollow">www.mindat.org/gallery.php?min=1804</a> |
日期 | |
來源 | Blue halite (Prairie Evaporite Formation, Middle Devonian; Potash Saskatchewan-Lanigan Mine, Saskatchewan, Canada) |
作者 | James St. John |
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這幅圖片原始出處為Flickr的https://flickr.com/photos/47445767@N05/32237025735 ,作者為James St. John 。經機器人FlickreviewR 2在2019年12月7日審查後確定為採用cc-by-2.0的協議授權使用。 |
2019年12月7日
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目前 | 2019年12月7日 (六) 18:59 | ![]() | 1,485 × 711(1.43 MB) | Ser Amantio di Nicolao(留言 | 貢獻) | Transferred from Flickr via #flickr2commons |
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寬度 | 1,485 px |
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高度 | 711 px |
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方位 | 標準 |
像素數量 | 3 |
水平解析度 | 650 dpi |
垂直解析度 | 650 dpi |
使用軟體 | Adobe Photoshop Elements 13.0 (Macintosh) |
檔案修改日期時間 | 2017年1月10日 (二) 18:30 |
Exif 版本 | 2.21 |
色彩空間 | sRGB |
原始文件唯一識別碼 | 776477D6C718561424F9A04381E7DE3F |
數位化的日期時間 | 2017年1月10日 (二) 13:27 |
詮釋資料最後修改日期 | 2017年1月10日 (二) 13:30 |