File:Molybdenite (Wolfram Camp, Dinbulah, Queensland, Australia) (19057113310).jpg
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Summary
DescriptionMolybdenite (Wolfram Camp, Dinbulah, Queensland, Australia) (19057113310).jpg |
Molybdenite from the Late Paleozoic of Australia. 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). The molybdenite sample shown above is from Wolfram Camp in Australia, where a quartz-rich molybdenite-wolframite-bismuth pipe occurs in altered roof zone rocks of the Elizabeth Creek Granite. The granite body contains pinkish monzogranites of Pennsylvanian to Early Permian age. Locality: Wolfram Camp, Dimbulah, northern Queensland, northeastern Australia Photo gallery of molybdenite: www.mindat.org/gallery.php?min=2746 |
Date | |
Source | Molybdenite (Wolfram Camp, Dinbulah, Queensland, 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@N05/19057113310. 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
Captions
Items portrayed in this file
depicts
some value
31 March 2007
0.01666666666666666666 second
5.6
200 millimetre
200
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:05, 15 July 2015 | ![]() | 1,667 × 1,164 (1.78 MB) | Natuur12 | Transferred from Flickr via Flickr2Commons |
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Metadata
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5.6 |
ISO speed rating | 200 |
Date and time of data generation | 12:50, 31 March 2007 |
Lens focal length | 200 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 16:58, 28 June 2015 |
Y and C positioning | Centered |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 12:50, 31 March 2007 |
Meaning of each component |
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Exposure bias | 0 |
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Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 80 |
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File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 300 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Soft |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Serial number of camera | 1004a0cc |
Date metadata was last modified | 12:58, 28 June 2015 |
Unique ID of original document | A6957F45386D6B44EC2B26F3CF91EE77 |