File:Fluorite in Devonian carbonate (Auglaize Quarry, near Junction, Ohio, USA) 3 (48883854387).jpg
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| Description |
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-. 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 also occurs in the southern Illinois area (Mississippi Valley-type deposits). Seen here is vug-filling fluorite in Devonian carbonate rock at a quarry in northwestern Ohio. The fluorite has dark blue iridescent surface films. Other vug-filling minerals at this site include calcite and sphalerite. Stratigraphy: derived from the Dundee Limestone or Lucas Dolomite, Devonian Locality: Auglaize Quarry (= Shelly Company, Stoneco's Auglaize Facility), southeast of the town of Junction, northeastern Paulding County, northwestern Ohio, USA (41° 10' 27.83" North latitude, 84° 25' 19.75" West longitude) Photo gallery of fluorite: <a href="http://www.mindat.org/gallery.php?min=1576" rel="noreferrer nofollow">www.mindat.org/gallery.php?min=1576</a> |
| Date | |
| Source | Fluorite in Devonian carbonate (Auglaize Quarry, near Junction, Ohio, USA) 3 |
| 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@N05/48883854387 (archive). It was reviewed on 18 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 02:51, 18 October 2019 | | 4,000 × 3,000 (7.7 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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