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 ?
Sector-boundary zoning--Sector-boundary zoning occurs in chiastolite (andalusite; Fig.
The lower diffractogram of Figure 6 shows the main phases of the kaolin sample H-RMC-21 without heat treatment, which shows the kaolinite ([Al.sub.2][Si.sub.2][O.sub.5][(OH).sub.4] with PDF 00-003-0052) and andalusite ([Al.sub.2]Si[O.sub.5], PDF 00-0390376).
Tender notice number : SRU/MM/GTE/2016-17/ Andalusite IFICO dated 16-07-2016
The occurrence of andalusite and sillimanite in these rocks can be associated to a superimposed low-P/high-T thermal event, although the presence of these polymorphs implies pressure below the [Al.sub.2]Si[O.sub.5] triple point, itself placed at 3.8 kbar (Holdaway, 1971).
These igneous bodies led to a contact metamorphism in the country rocks with the growth of biotite, cordierite and andalusite.
y Halimi, R.: "Formation of [Al.sub.2][O.sub.3]-SiC powder from andalusite and carbon".
Exotic gems; v.2: how to identify and buy alexandrite, andalusite, chrysoberyl cat's-eye, kyanite, common opal, fire opal, dinosaur gembone, tsavorite, rhodolite & other garnets.
Previous drilling at Guadalupito has demonstrated its potential for multi commodity project including Magnetite, Gold, Andalusite, Ilmenite, Zircon, Rare Earths and Tungsten.
The actual-size depiction is good for specimens that are full-page size, but what is the point of showing a 0.8-inch image of a phosphophyllite crystal or a 1.4-inch image of an andalusite crystal, each sitting totally alone (except for some caption text) on big black 12 X 13-inch pages?
The minerals in sand ate 93% to 96% quartz, opaque heavy minerals between 3% - 5% and the remaining 1% - 3% minerals in decreasing order, muscovite, homblende, chlorite, tourmaline, staurolite, garnet, andalusite, biotite and zircon.
In 2005, it was the world's leading producer of andalusite, chromite, ferrochrome, gold, platinum-group metals, vanadium and vermiculite, and the world's fifth ranked producer of industrial diamonds (Holmberg 2007).
The Model T's famous "any color as long as it's black" was replaced by a rainbow of shades, including Apple Green, Andalusite Blue, Thorne Brown, Yukon Yellow and Deep Ford Maroon.