File:Galena (Frontenac Draper Lake Lead Mine, Ontario, Canada).jpg
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Summary
[edit]DescriptionGalena (Frontenac Draper Lake Lead Mine, Ontario, Canada).jpg |
Galena from Ontario, Canada. 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. Galena is a lead sulfide mineral (PbS). It has a metallic luster, silvery-gray color, cubic crystals, cubic cleavage, is moderately soft, and has a very high specific gravity (it's very heavy for its size). Galena is the most important lead ore mineral. It's principally found in hydrothermal vein systems and in Mississippi Valley-type deposits. Silver (Ag) can fall into the lead position as an impurity, sometimes in relatively high proportions. This results in argentiferous galena, (Pb,Ag)S. Historically, lead from galena has been used as a gasoline additive, a paint ingredient, and for making bullets. Lead is also used to make various metal products, batteries, and radiation shielding. Locality: Frontenac Draper Lake Lead Mine, just west of the town of Perth Road, Frontenac County, southeastern Ontario, Canada Photo gallery of galena: www.mindat.org/gallery.php?min=1641 |
Date | |
Source | Galena (Frontenac Draper Lake Lead Mine, Ontario, Canada) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/18129150050. It was reviewed on 12 June 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
12 June 2015
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current | 04:06, 12 June 2015 | 1,951 × 1,254 (2.05 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Date and time of data generation | 11:41, 16 April 2010 |
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Bits per component |
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File change date and time | 15:42, 31 May 2015 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:41, 16 April 2010 |
Meaning of each component |
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APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
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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 |
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Serial number of camera | 200638ad |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 11:42, 31 May 2015 |
Unique ID of original document | AB129D24F680FF53D97B79547EA28D7D |