File:Caclite in limestone (Dundee Limestone, Middle Devonian; Auglaize Quarry, near Junction, Ohio, USA) (48883101213).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 carbonate minerals all contain one or more carbonate (CO3-2) anions. Calcite is a common mineral. It is calcium carbonate (CaCO3). It has a nonmetallic luster, commonly clearish to whitish to yellowish to grayish in color, is moderately soft (H≡3), moderately light-weight, has hexagonal crystals, and rhombohedral cleavage (three cleavage planes at 75º & 105º angles - cleavage pieces look like lopsided boxes). The easiest way to identify calcite is to drop acid on it - it easily bubbles (effervesces) in acid. The bubbles are carbon dioxide gas. If the acid is dilute hydrochloric acid, the chemical reaction is: 2HCl(aq) + CaCO3(s) -->> CO2(g)↑ + H2O(l) + CaCl2(aq) The most important & voluminous calcitic rocks in the world are limestone (sedimentary), marble (metamorphic), carbonatite (igneous), and travertine (speleothem, or "cave formations", and many hotspring deposits). Quite a few hydrothermal veins in the world are calcitic or have calcite as a principal component. Seen here is a patch of light-colored, coarsely-crystalline calcite in gray, fine-grained Devonian limestone at a quarry in northwestern Ohio. Other vug-filling minerals at this site include sphalerite and fluorite. Stratigraphy: likely derived from the Dundee Limestone, Middle 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 calcite: <a href="http://www.mindat.org/gallery.php?min=859" rel="noreferrer nofollow">www.mindat.org/gallery.php?min=859</a> |
| Date | |
| Source | Caclite in limestone (Dundee Limestone, Middle Devonian; Auglaize Quarry, near Junction, Ohio, USA) |
| 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@N05/48883101213 (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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 02:51, 18 October 2019 | | 3,224 × 2,786 (4.14 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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