File:Sylvanite-kaolinite (Judith Mountains, Montana, USA) 1.jpg
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Summary
[edit]DescriptionSylvanite-kaolinite (Judith Mountains, Montana, USA) 1.jpg |
English: Sylvanite-kaolinite from the Judith Mountains of Montana, USA. (SDSMT 4464, South Dakota School of Mines and Technology, Museum of Geology, Rapid City, South Dakota, USA)
Dark silvery gray = sylvanite White = kaolinite (Al2Si2O5(OH4) - aluminum hydroxy-silicate) 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 telluride minerals contain one or more telluride anions (Te-2). The tellurides are usually considered together with the sulfide minerals, the arsenide minerals, and the sulfarsenide minerals. Sylvanite is a rare precious metal telluride mineral, (Au,Ag)2Te4 - gold silver telluride. This mineral volatilizes at relatively low temperatures. With heating, the tellurium component of sylvanite readily vaporizes, leaving behind blebs of gold/silver. Sylvanite has a metallic luster, a bright silver color, is fairly soft, and usually occurs in the form of elongated blades or small granular masses. It is known from only a few scattered localities on Earth and occurs with other telluride minerals such as calaverite (AuTe2 - gold telluride). Sylvanite is an important gold/silver ore mineral in precious metal telluride deposits such as the Golden Quadrilateral in Romania, near Kalgoorlie in western Australia, and the Cripple Creek Diatreme in Colorado, USA. Photo gallery of sylvanite: www.mindat.org/gallery.php?min=3849 |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/19151680634/ |
Author | jsj1771 |
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current | 19:18, 19 July 2015 | 1,851 × 1,662 (2.33 MB) | Natuur12 (talk | contribs) | User created page with UploadWizard |
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Metadata
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5.6 |
ISO speed rating | 400 |
Date and time of data generation | 12:27, 18 August 2010 |
Lens focal length | 200 mm |
Width | 3,008 px |
Height | 2,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 09:32, 17 July 2015 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 12:27, 18 August 2010 |
Meaning of each component |
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Image compression mode | 4 |
APEX shutter speed | 5.906891 |
APEX aperture | 4.970854 |
APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 10 |
DateTimeOriginal subseconds | 10 |
DateTimeDigitized subseconds | 10 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
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 | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 200638ad |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 04:32, 17 July 2015 |
Unique ID of original document | E02CDB9FD116E1F325D76522C0F0CC89 |