File:Calcite aggregate concretion (Malyi Claypit, Hungary) 1.jpg
![File:Calcite aggregate concretion (Malyi Claypit, Hungary) 1.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/94/Calcite_aggregate_concretion_%28Malyi_Claypit%2C_Hungary%29_1.jpg/800px-Calcite_aggregate_concretion_%28Malyi_Claypit%2C_Hungary%29_1.jpg?20201119181755)
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[edit]DescriptionCalcite aggregate concretion (Malyi Claypit, Hungary) 1.jpg |
English: Calcite aggregate concretion from Hungary.
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 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 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. The bizarre specimen shown above is a composite calcite concretion developed in siliciclastic sediments ("sand concretion"). The host sediments were deposited in the Pannonian Sea, an ancient inland sea in east-central Europe. It existed during the Miocene and Pliocene. Locality: Malyi Brickyard Limited Claypit, Miskolc District, Bukk Mountains, Borsod-Abaúj-Zemplén County, northeastern Hungary Photo gallery of calcite: www.mindat.org/gallery.php?min=859 |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/34199138930/ |
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@N05/34199138930. It was reviewed on 19 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
19 November 2020
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current | 18:17, 19 November 2020 | ![]() | 3,658 × 2,743 (5.69 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/34199138930/ with UploadWizard |
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Date and time of data generation | 11:16, 6 May 2017 |
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Image title | |
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Horizontal resolution | 180 dpi |
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Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 18:15, 10 May 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 11:16, 6 May 2017 |
Meaning of each component |
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Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 14:15, 10 May 2017 |
Unique ID of original document | EEC8F32F04E4B9338E7632347D937C0D |
IIM version | 18,755 |