File:Cobaltoan calcite (Shaba, Zaire).jpg
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DescriptionCobaltoan calcite (Shaba, Zaire).jpg |
English: Cobaltoan calcite from Zaire, Africa. (3.8 centimeters across at its widest)
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 deep pinkish-purple coloration present in the calcite shown above is from significant cobalt impurity (Co +2), resulting in the chemical formula (Ca,Co)CO3. Locality: unrecorded site in Shaba Province/Katanga Province, Zaire ("D.R. Congo"), south-central Africa Photo gallery of cobaltoan calcite: www.mindat.org/gallery.php?min=1094 |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/32181560535/ |
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@N05/32181560535. 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 | 816 × 608 (454 KB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/32181560535/ with UploadWizard |
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Orientation | Normal |
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Horizontal resolution | 525 dpi |
Vertical resolution | 525 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 05:37, 8 January 2017 |
Y and C positioning | Centered |
Exif version | 2.21 |
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Supported Flashpix version | 1 |
Color space | sRGB |
Date and time of digitizing | 00:36, 8 January 2017 |
Date metadata was last modified | 00:37, 8 January 2017 |
Unique ID of original document | FDCD6920D77CA2BE808B54080D29AB81 |