File:Bismuthinite & molybdenite in pegmatitic granite (Preissac-Lacorne Batholith, Neoarchean, 2.630-2.675 Ga; Moly Hill, Quebec, Canada) 1 (18307442934).jpg
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[edit]DescriptionBismuthinite & molybdenite in pegmatitic granite (Preissac-Lacorne Batholith, Neoarchean, 2.630-2.675 Ga; Moly Hill, Quebec, Canada) 1 (18307442934).jpg |
Bismuthinite & molybdenite in pegmatitic granite from the Precambrian of Quebec, Canada. (3.4 cm across at its widest) Silvery gray = bismuthinite (Bi2S3 - bismuth sulfide) Glassy gray at lower right = quartz (SiO2 - silicon dioxide) Cream/buff-colored material at upper left = potassium feldspar (KAlSi3O8 - potassium aluminosilicate) Small, slightly bluish silvery gray area near center = molybdenite (MoS2 - molybdenum 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. Bismuthinite is a scarce bismuth sulfide mineral (Bi2S3). It's similar to stibnite (www.flickr.com/photos/jsjgeology/sets/72157654303222578) in its physical properties, and fine-grained specimens are difficult to distinguish visually. Bismuthinite has a metallic luster, silver color, gray streak, one perfect cleavage, is fairly soft (H = 2 to 2.5), and has a high specific gravity (it's heavy for its size). Nicely crystalline specimens often display radiating masses of long, needle-shaped crystals. Finer-grained and massive bismuthinite also occur. Crystals of bismuthinite are known to be slightly flexible, and the crystal faces typically have fine striations. Bismuthinite is a key ore mineral for the element bismuth (Bi). It principally occurs in hydrothermal vein deposits, some pegmatites, and some volcanic exhalation deposits. The rock shown above is a piece of pegmatitic granite having quartz, potassium feldspar, molybdenite, and bismuthinite. Geologic unit & age: pegmatite body in the Preissac-Lacorne Batholith, Abitibi Greenstone Belt, late Neoarchean, 2.630 to 2.675 Ga Locality: Moly Hill, western Quebec, southeastern Canada Photo gallery of bismuthinite: www.mindat.org/gallery.php?min=686 |
Date | |
Source | Bismuthinite & molybdenite in pegmatitic granite (Preissac-Lacorne Batholith, Neoarchean, 2.630-2.675 Ga; Moly Hill, Quebec, Canada) 1 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://flickr.com/photos/47445767@N05/18307442934. It was reviewed on 27 July 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
27 July 2015
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 650 dpi |
Vertical resolution | 650 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 14:04, 18 June 2015 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | C76B00A3DADFF1957CD69D49423BFA5E |
Date and time of digitizing | 10:02, 18 June 2015 |
Date metadata was last modified | 10:04, 18 June 2015 |