File:Covellite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Leonard Mine, Butte, Montana, USA) 2 (18826159746).jpg
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[edit]DescriptionCovellite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Leonard Mine, Butte, Montana, USA) 2 (18826159746).jpg |
Covellite-pyrite hydrothermal vein sample from Montana, USA. (1.9 cm across at its widest) Metallic blue = covellite Brassy gold = pyrite (FeS2 - iron sulfide) 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. Covellite is an attractive, deep metallic blue mineral having the formula CuS - copper sulfide. It's principally a secondary sulfide mineral, formed by the breakdown of pre-existing copper-bearing sulfides, but also occurs in a massive or crystalline form as a primary mineral. Covellite has a metallic luster, an intensely deep blue or purplish blue color, a dark gray streak, and is quite soft (H = 1.5 to 2). Well-formed crystals are hexagonal plates with a somewhat micaceous appearance. The covellite sample shown above is from Montana's Butte Mining District. In this area, covellite occurs in 62 to 66 million year old copper sulfide-rich hydrothermal veins that intrude the Butte Quartz Monzonite, a pluton of the Boulder Batholith (mid-Campanian Stage, late Late Cretaceous, 76 million years). Locality: Leonard Mine, Butte Mining District, Silver Bow County, southwestern Montana, USA Photo gallery of covellite: www.mindat.org/gallery.php?min=1144 |
Date | |
Source | Covellite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Leonard Mine, Butte, Montana, USA) 2 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/18826159746. It was reviewed on 16 June 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
16 June 2015
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current | 07:50, 16 June 2015 | 799 × 717 (606 KB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Width | 960 px |
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Height | 720 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 96 dpi |
Vertical resolution | 96 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 02:22, 16 June 2015 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | 62E42701E44ECB2DED01D8E3E7260375 |
Date and time of digitizing | 14:46, 19 February 2011 |
Date metadata was last modified | 22:22, 15 June 2015 |