File:Hornblende amphibole (31733452843).jpg
![File:Hornblende amphibole (31733452843).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/10/Hornblende_amphibole_%2831733452843%29.jpg/800px-Hornblende_amphibole_%2831733452843%29.jpg?20191206031826)
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Summary
editDescriptionHornblende amphibole (31733452843).jpg |
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 5100 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. Amphibole is a group of silicate minerals. The garden-variety type of amphibole is hornblende (~(Ca,Na)2-3(Mg,Fe,Al)5Si6(Si,Al)2O22(OH)2 - calcium sodium magnesium iron hydroxy-aluminosilicate). Hornblende has a nonmetallic luster, jet black to very dark green color, pale greenish-gray streak, a hardness of about 5.5 on the Mohs Hardness Scale, and two cleavage planes at ~60º and ~120º. Many specimens, even at a microscopic scale, show a splintery fracture network. Hornblende is a common mafic mineral in granites & granodiorites. Photo gallery of hornblende: <a href="https://www.mindat.org/gallery.php?min=1930" rel="nofollow">www.mindat.org/gallery.php?min=1930</a> |
Date | |
Source | Hornblende amphibole |
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@N05/31733452843 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 December 2019
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current | 03:18, 6 December 2019 | ![]() | 1,523 × 786 (1.85 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Width | 1,566 px |
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Height | 799 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 700 dpi |
Vertical resolution | 700 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 22:00, 26 January 2017 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | 13F432C78F2DBDBE0E16C5751D1E6291 |
Date and time of digitizing | 16:58, 26 January 2017 |
Date metadata was last modified | 17:00, 26 January 2017 |