File:Calcite (Columbus, Ohio, USA) 1.jpg
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editDescriptionCalcite (Columbus, Ohio, USA) 1.jpg |
English: Calcite from the Devonian of Ohio, USA. (photo provided by Shelby Hamm)
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. Geologic context: calcite from a concretion in the Ohio Shale (probably the Huron Shale Member of the lower Ohio Shale), upper Frasnian Stage or lower Famennian Stage, mid-Upper Devonian Locality: pipeline construction cut near the intersection of Interstate 270 and Rt. 315, northern side of the Columbus urban area, northern Franklin County, central Ohio, USA Photo gallery of calcite: www.mindat.org/gallery.php?min=859 |
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Source | https://www.flickr.com/photos/47445767@N05/30466234330/ |
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@N05/30466234330. 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 | ![]() | 1,724 × 1,530 (1.71 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/30466234330/ with UploadWizard |
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Camera manufacturer | Apple |
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Camera model | iPhone 5s |
Exposure time | 1/148 sec (0.0067567567567568) |
F-number | f/2.2 |
ISO speed rating | 32 |
Date and time of data generation | 20:27, 30 June 2016 |
Lens focal length | 4.2 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 01:30, 4 November 2016 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 20:27, 30 June 2016 |
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APEX aperture | 2.2750070442378 |
APEX brightness | 6.7263726372637 |
APEX exposure bias | 0 |
Metering mode | Spot |
Flash | Flash fired, compulsory flash firing |
DateTimeOriginal subseconds | 506 |
DateTimeDigitized subseconds | 506 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
Scene type | A directly photographed image |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Focal length in 35 mm film | 29 mm |
Scene capture type | Standard |
Lens used | iPhone 5s back camera 4.15mm f/2.2 |
Date metadata was last modified | 19:30, 3 November 2016 |
Unique ID of original document | 46E4DE473D24C54F7E0FBA1C558BA72E |