andalusite


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Related to andalusite: sillimanite

andalusite

[¦an·də′lü‚sīt]
(mineralogy)
Al2SiO5 A brown, yellow, green, red, or gray neosilicate mineral crystallizing in the orthorhombic system, usually found in metamorphic rocks.
References in periodicals archive ?
The formation is chlorite-grade except in the aureole of the Blue Hill Pluton where rare, pelitic beds contain andalusite.
In Minerals for Refractories, to support demand growth on some markets, particularly due to substitution to other minerals, a refractory clay calciner was built in the Andersonville (Georgia, United States) plant and the andalusite production capacity extension in Yilong (China), a company acquired in 2007, is in progress.
Near the ore contacts, the rock is often classified as an "ore quartzite" which is actually the tuff that has been altered to mostly quartz, garnet, mica, minor andalusite and other metamorphic minerals.
The leucogranite contains 0-2% biotite, 3-28% muscovite, 0-8% topaz, 0-2% andalusite, and trace amounts of cordierite (MacDonald 2001).
The Musquodoboit Batholith (MB) intrudes metasedimentary rocks of the Meguma Group, and a narrow contact metamorphic aureole containing cordierite porphyroblasts in finer grained biotite and andalusite hornfels is developed within a few hundred metres of the contact (MacDonald and Clarke 1985; Ham 1993; Horne et al.
Sikaman has also signed a Heads of Agreement whereby it can acquire a 100 percent interest in the producing Hoogenoeg Andalusite mine in the Transvaal region of South Africa.
It produced a narrow (approximately 400 m wide) contact metamorphic aureole of spotted hornfels containing andalusite and cordierite superimposed on biotite zone assemblages (Cullen 1983).
In the Andalusite activity in South Africa, operations were further optimized with the progressive closure of the Annesley site and the reopening of the Havercroft site.
It is proposed that Enro and its partners will sell to Sikaman no less than 75 percent and up to a 100 percent interest in Hoogenoeg Andalusite Pty.
born geologist, has extensive experience in the evaluation and development of mineral projects which include wollastonite and kaolin deposits in the Czech Republic; gold, rare earth and iron deposits in South East Asia; copper and sapphires in the United States; tantalum and niobium deposits in Mozambique; and chrome, coal, andalusite and granite deposits in South Africa.
All the granitoid rocks of the SMB are peraluminous, as expressed by the presence of corundum in the normative mineralogy and by the local occurrence of primary muscovite, cordierite, andalusite, garnet, and topaz.