File:Potassium feldspar 14.jpg
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[edit]DescriptionPotassium feldspar 14.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 5800 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. The simplest & most abundant silicate mineral in the Earth's crust is quartz (SiO2). All other silicates have silica + impurities. Many silicates have a significant percentage of aluminum (the aluminosilicates). Feldspar is a group of common silicate minerals. Feldspars are silicate minerals having one-fourth of all the silicons in SiO2 replaced by aluminum (Si4O8 to (Si3Al)O8). When this happens, the (Si3Al)O8 has a -1 electric charge. The charge is satisfied by the addition of one or more metals. The (Si3Al)O8- structure has relatively large holes, and the only metals that tend to stay in these holes are: K (potassium), Na (sodium), Ca (calcium), Cs (cesium), Ba (barium), Sr (strontium), and Pb (lead). Of these, K & Na & Ca are the most common metals that enter the matrix. Sometimes, several different metals enter the structure, resulting in "garbage can minerals". Chemical analyses of feldspars show that they range in composition from K-feldspar to Na-feldspar and from Na-feldspar to Ca-feldspar. Mineralogists have thus established two "families" of feldspars. There is no chemical gradient between K-feldspar and Ca-feldspar. The potassium feldspars (K-feldspars) (also known as alkali feldspars) are those that range in composition from pure K-feldspar to pure Na-feldspar (actually, feldspars with ~even & random mixes of potassium and sodium are rare). The feldspars with Na and/or Ca are the plagioclase feldspars. All feldspars have similar physical properties: a hardness of 6 on the Mohs Hardness Scale, a white streak, and two cleavage planes at or very near 90º. Potassium feldspar is usually whitish to cream-colored to pinkish-orangish-salmon colored. "Potassium feldspar" refers to a group of several different K-rich minerals: orthoclase, microcline, adularia, sanidine, and anorthoclase. Orthoclase, microcline, and adularia have the chemical formula KAlSi3O8 - potassium aluminosilicate. Sanidine and anorthoclase have the formula (K,Na)AlSi3O8. Photo gallery of orthoclase: www.mindat.org/gallery.php?min=3026 Photo gallery of microcline: www.mindat.org/gallery.php?min=2704 Photo gallery of adularia: www.mindat.org/gallery.php?min=28 Photo gallery of sanidine: www.mindat.org/gallery.php?min=3521 Photo gallery of anothoclase: www.mindat.org/gallery.php?min=248 |
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Source | https://www.flickr.com/photos/47445767@N05/52677643123/ |
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@N05/52677643123. It was reviewed on 9 February 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
9 February 2023
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current | 15:28, 9 February 2023 | ![]() | 2,573 × 1,843 (3.14 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52677643123/ 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/10 |
ISO speed rating | 80 |
Date and time of data generation | 14:18, 30 January 2023 |
Lens focal length | 9.681 mm |
Width | 4,000 px |
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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 | 14:17, 8 February 2023 |
Exif version | 2.21 |
Date and time of digitizing | 14:18, 30 January 2023 |
Meaning of each component |
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APEX shutter speed | 5.90625 |
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APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.625 APEX (f/3.51) |
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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 | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 09:17, 8 February 2023 |
Unique ID of original document | 0B5D56BF301096F7EF1F8D0B59028E7A |
IIM version | 2 |