File:Calcite (2nd Sovietsky Mine, Dalnegorsk, Russia) 2.jpg
Original file (1,933 × 2,867 pixels, file size: 3.06 MB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]_2.jpg&action=edit§ion=1){kind=link}
| Description |
English: Calcite from Russia.
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 remarkable large calcite shown above has an odd crystal form - the label described it as a prism and pinacoid. It comes from a polymetallic sulfide ore body at the famous Dalnegorsk skarn deposit in far-eastern Russia. Locality: 2nd Sovietsky Mine, Dalnegorsk, far-eastern Russia Photo gallery of calcite: www.mindat.org/gallery.php?min=859 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/34199929760/ |
| Author | James St. John |
Licensing
[edit]_2.jpg&action=edit§ion=2){kind=link}
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
|
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/34199929760. 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. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:18, 19 November 2020 | | 1,933 × 2,867 (3.06 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/34199929760/ with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
_2.jpg&oldid=888003361){kind=link}