File:Red muscovite mica (North Bay area, Ontario.jpg
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Summary[edit]
DescriptionRed muscovite mica (North Bay area, Ontario.jpg |
Red muscovite mica from Ontario, Canada. (~7.8 cm 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 4900 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. Shown above is a rare color variety of muscovite mica. Muscovite is a common phyllosilicate - it has a nonmetallic luster, a hardness of about 2, forms hexagonal crystals, and has one perfect cleavage. Muscovite mica can be peeled into ultrathin sheets, which is a consequence of its cleavage. Thin cleavage sheets are noticeably flexible (elastic). Thicker pieces of muscovite are grayish-colored. Thin sheets are clear/colorless. The rock shown above is composed of numerous red muscovite crystals. I have not encountered any specific information about why it is red. I have not been able to determine its geologic context or age (but it's probably Precambrian). Locality: unrecorded/undisclosed site at or near the town of North Bay, eastern side of Lake Nipissing, southeastern Ontario, southeastern Canada |
Date | |
Source | Red muscovite mica (North Bay area, Ontario, Canada) |
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@N05/25478914143. It was reviewed on 13 April 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
13 April 2016
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current | 16:59, 13 April 2016 | 3,405 × 1,819 (4.9 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
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F-number | f/9 |
ISO speed rating | 80 |
Date and time of data generation | 21:35, 27 March 2016 |
Lens focal length | 8.295 mm |
Image title | |
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 13.0 (Macintosh) |
File change date and time | 21:44, 27 March 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 21:35, 27 March 2016 |
Meaning of each component |
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APEX shutter speed | 5.90625 |
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APEX exposure bias | −0.66666666666667 |
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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 | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 15:44, 27 March 2016 |
Unique ID of original document | BCD7694E9720684FB33F1C0D3517DC26 |
IIM version | 24,576 |