File:Molybdenite (Australia) (19055908840).jpg
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Summary
[edit]DescriptionMolybdenite (Australia) (19055908840).jpg |
Molybdenite from Australia. (CMNH 4647, Cleveland Museum of Natural History, Cleveland, Ohio, USA) 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 sulfide minerals contain one or more sulfide anions (S-2). The sulfides are usually considered together with the arsenide minerals, the sulfarsenide minerals, and the telluride minerals. Many sulfides are economically significant, as they occur commonly in ores. The metals that combine with S-2 are mainly Fe, Cu, Ni, Ag, etc. Most sulfides have a metallic luster, are moderately soft, and are noticeably heavy for their size. These minerals will not form in the presence of free oxygen. Under an oxygen-rich atmosphere, sulfide minerals tend to chemically weather to various oxide and hydroxide minerals. Molybdenite is a molybdenum sulfide mineral (MoS2). It has hexagonal crystals, metallic luster, a bright silvery color, and a dark gray streak. It is fairly soft (H=2) and has one cleavage. Molybdenite is especially distinctive in being flexible - thin scales or plates of molybdenite will easily bend but won't snap back into shape like biotite or muscovite mica. Molybdenite is nearly identical to graphite (C) in its physical characteristics (see: www.flickr.com/photos/jsjgeology/sets/72157650963514503). Graphite is a principally a metamorphic mineral. Molybdenite is usually an igneous mineral, occurring in hydrothermal veins and pegmatites. It also occurs in some contact metamorphic rocks (skarns - www.flickr.com/photos/jsjgeology/sets/72157646562268189). Photo gallery of molybdenite: www.mindat.org/gallery.php?min=2746 |
Date | |
Source | Molybdenite (Australia) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/19055908840. It was reviewed on 15 July 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
15 July 2015
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot A530 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/3.2 |
ISO speed rating | 100 |
Date and time of data generation | 02:38, 17 January 2011 |
Lens focal length | 7.889 mm |
Width | 2,592 px |
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Bits per component |
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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 | 16:11, 28 June 2015 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 02:38, 17 January 2011 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 3.34375 |
APEX exposure bias | 0 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash fired, auto mode, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
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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 | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 5.8-23.2 mm |
Date metadata was last modified | 12:11, 28 June 2015 |
Unique ID of original document | 2C67B25998608C1069F3EA10F595C3FB |