File:Rubellite tourmaline 2 (cropped).jpg
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Summary
[edit]DescriptionRubellite tourmaline 2 (cropped).jpg |
English: Rubellite tourmaline (~1 centimeter across at its widest; 2.25 carats)
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. Tourmaline is a classic "garbage-can mineral" - it has a little bit of just about everything. Tourmaline can be given the formula (Na,Ca)(Li,Mg,Al)(Fe,Mn,Al)6(BO3)3(Si6O18)(OH,F)4 - sodium calcium lithium magnesium iron manganese hydroxy-fluoro-boro-aluminosilicate. Tourmaline has a nonmetallic luster, varies in color but is often blackish, has a white streak, is quite hard (H = 7 to 7.5), frequently has elongated crystals with rounded triangular cross-sections and striated faces, no cleavage, and conchoidal fracture. Tourmaline is a group of minerals, the most common of which is the blackish-colored, Fe-rich schorl (see elsewhere in this photo album). Dark brown, Mg-rich dravite is another moderately common variety of tourmaline. Other varieties include achroite, elbaite (Li and Na-rich), indicolite, liddicoatite (Li and Ca-rich), rubellite, verdelite, and others. The latter-listed tourmalines are often richly colored (greenish, yellowish, reddish, pinkish, bluish, multicolored). Tourmaline is moderately common in pegmatites and some metamorphic rocks. It can even be rock-forming - see the scarce rock tourmalinite (www.flickr.com/photos/jsjgeology/15095512541). The faceted gemstone seen here is rubellite tourmaline, a sodium lithium hydroxy-boro-aluminosilicate - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4. Photo gallery of tourmaline & rubellite: www.mindat.org/gallery.php?min=4003 and www.mindat.org/gallery.php?min=3472 |
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Date | ||||
Source | https://www.flickr.com/photos/47445767@N05/51715172290/ | |||
Author | James St. John | |||
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:50, 24 January 2022 | 830 × 647 (412 KB) | Ra'ike (talk | contribs) | File:Rubellite tourmaline 2.jpg cropped 43 % horizontally using CropTool with lossless mode. |
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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/9 |
ISO speed rating | 80 |
Date and time of data generation | 13:26, 29 November 2021 |
Lens focal length | 8.295 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 | 21:46, 29 November 2021 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:26, 29 November 2021 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
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 | 16:46, 29 November 2021 |
Unique ID of original document | 0BF6DD4DF2CEB436B420A161A3368531 |