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Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within the ...
TASTE Holdings is a South African management group with subsidiaries in the food and jewellery market. It is listed on the JSE with ticker symbol is of TAS, after it have been moved from the AltX board in June 2011.
Smoky quartz is a brown to black variety of quartz. It goes by various names, depending on the colour: a dark-brown to black opaque variety is called "morion"; a yellow-brown variety from Scotland is known as "cairngorm", the colour being a result of ferric oxide impurity.
The Struben brothers were engaged in active mining operations at Confidence Reef until 1888, extracting gold from a quartz vein that they had discovered. Following their departure, the site retained its importance within South Africa's mining history.
A rough specimen of bloodstone. Heliotropes (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstones, or simply bloodstones) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper or sometimes as chalcedony (translucent).
The company was founded in 1975 by a consortium that included Anthony Simon Malone, and acquired Rand London Mines. In the following years Metorex acquired additional properties mining a variety of minerals including gold, coal, asbestos, copper, zinc and tin. The mines were located in South Africa, Namibia and Zambia.
Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [citation needed] but it has also been mined in the Lower Silesia region of Poland. Naturally occurring prasiolite has also been found in the Thunder Bay area of ...
Crocidolite asbestos was mined in South Africa, Bolivia, and Wittenoom, Western Australia. Bolivian crocidolite was used in approximately 13 billion Kent Micronite cigarette filters, manufactured from March 1952 until at least May 1956 by the Lorillard Tobacco Company (now part of the R. J. Reynolds Tobacco Company ).