File:Dumortierite-quartz (Brazil) 6.jpg
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Summary
[edit]DescriptionDumortierite-quartz (Brazil) 6.jpg |
English: 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 5700 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 silicates are the most abundant and chemically complex group of minerals. All silicates have silica as the basis for their chemistry. "Silica" refers to SiO2 chemistry. The fundamental molecular unit of silica is one small silicon atom surrounded by four large oxygen atoms in the shape of a triangular pyramid - this is the silica tetrahedron - SiO4. Each oxygen atom is shared by two silicon atoms, so only half of the four oxygens "belong" to each silicon. The resulting formula for silica is thus SiO2, not SiO4. Dumortierite is a scarce silicate mineral having the formula (Al,Fe)7(SiO4)3(BO3)O3 - aluminum iron borosilicate. It is often bluish, but can be other colors (greenish, purplish, pinkish, reddish). Dumortierite is fairly hard (H=7 to 8 on the Mohs Hardness Scale). Seen here is a dumortierite-quartz specimen from the Precambrian of Brazil. It comes from an area having dumortierite-bearing quartzites (= metamorphosed sandstones) that are quarried, cut, and polished as decorative stones ("Azul Macaubas"). Locality: unrecorded/undisclosed site in Brazil (but probably from or near the Vaca Morta Quarry, southwest of Boquira, Bahia State, eastern Brazil) Photo gallery of dumortierite: www.mindat.org/gallery.php?min=1329 |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/51689370916/ |
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@N05/51689370916. It was reviewed on 27 December 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
27 December 2021
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current | 18:05, 27 December 2021 | 2,119 × 1,387 (1.92 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51689370916/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 15:05, 17 November 2021 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 20:35, 17 November 2021 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:05, 17 November 2021 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 15:35, 17 November 2021 |
Unique ID of original document | 128D22FC2543DF1C1B4FF55E54873723 |