File:Skutterudite (vein in a fault system in the Bou Azzer-El Graara Ophiolite; Tamdrost Mine, Bou Azzer Mining District, Morocco) 1 (19239121512).jpg

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Skutterudite from Morocco. (2.0 cm across at its widest)

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 arsenide minerals contain one or more arsenide anions (As-3). The arsenides are usually considered together with the sulfide minerals, the sulfarsenide minerals, and the telluride minerals.

Skutterudite is an uncommon cobalt-nickel arsenide mineral ((Co,Ni)As3). Skutterudite has a metallic luster, bright silvery color, black streak, no cleavage, moderate hardness (H = 5.5 to 6), and moderately high density. It can be an important ore mineral of cobalt and nickel, and is typically found in hydrothermal veins.

The beautifully crystalline skutterudite shown above is from a cobalt-nickel mineralized vein in a fault system within the Bou Azzer-El Graara Ophiolite of Morocco. The ophiolite complex is Proterozoic in age, but the skutterudite mineralization postdates the host rocks.

Locality: Tamdrost Mine, Bou Azzer Mining District, 30 km south of Tazenakht, central Anti-Atlas Mountains, central Morocco

Photo gallery of skutterudite:

www.mindat.org/gallery.php?min=3682
Date
Source Skutterudite (vein in a fault system in the Bou Azzer-El Graara Ophiolite; Tamdrost Mine, Bou Azzer Mining District, Morocco) 1
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/19239121512. 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

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