File:Fluorite - dioctahedral cleavage pieces.jpg
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Summary
DescriptionFluorite - dioctahedral cleavage pieces.jpg |
English: Fluorite - dioctahedral cleavage pieces.
Yellow fluorite = 11 mm across Clear & green fluorites = 14 mm across each Dark purple fluorite = 12 mm 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 about 5400 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-. Fluorite is a calcium fluoride mineral (CaF2). The most diagnostic physical property of fluorite is its hardness (H≡4). Fluorite typically forms cubic crystals and, when broken, displays four cleavage planes (also quite diagnostic). When broken under controlled conditions, the broken pieces of fluorite form double pyramids. Fluorite is a good example of a mineral that can be any color. Common fluorite colors include clear, purple, blue, green, yellow, orange, and brown. The stereotypical color for fluorite is purple. Purple is the color fluorite "should be". A mineral collector doesn't have fluorite unless it's a purple fluorite (!). Fluorite occurs in association with some active volcanoes. HF emitted from volcanoes can react with Ca-bearing rocks to form fluorite crystals. Many hydrothermal veins contain fluorite. Much fluorite occurs in the southern Illinois area (Mississippi Valley-type deposits). Photo gallery of fluorite: www.mindat.org/gallery.php?min=1576 |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/32237020835/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/32237020835 (archive). It was reviewed on 22 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
22 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:26, 22 December 2019 | ![]() | 1,611 × 555 (1.13 MB) | Ser Amantio di Nicolao | User created page with UploadWizard |
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Width | 1,611 px |
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Height | 555 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 700 dpi |
Vertical resolution | 700 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 18:31, 10 January 2017 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | A54EE1C7EE5A10E217622DB9991128B8 |
Date and time of digitizing | 13:26, 10 January 2017 |
Date metadata was last modified | 13:31, 10 January 2017 |