Kyanite


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kyanite

[′kī·ə‚nīt]
(mineralogy)
Al2SiO5 A blue or light-green neosilicate mineral; crystallizes in the triclinic system, and luster is vitreous to pearly; occurs in long, thin bladed crystals and crystalline aggregates. Also known as cyanite; disthene; sappare.

Kyanite

 

(also called disthene), a silicate mineral with the chemical composition Al2[SiO4]O. Kyanite contains up to 63.1 percent Al2O3 and sometimes up to 2 percent admixtures of iron oxide or chromium oxide. It crystallizes in the triclinic system, forming long columnar or tabular crystals and their aggregates. Its color ranges from greenish blue to dark blue-green and yellow; sometimes it is colorless. The mineral is characterized by a sharp anisotrophy in hardness. In the direction parallel to the length of the crystal the hardness equals 4.5, and in the direction at right angles, it is up to 7.5. The density ranges from 3,560 to 3,680 kg/m3. Kyanite is formed with the plutonic metamorphism of clay-rich sedimentary rocks; it is also encountered in quartz veins and contact zones of pegmatites. It is used as a valuable high-alumina raw material for refractory and acidresistant articles and for spark plug insulators for internal combustion engines.

References in periodicals archive ?
This section contained the largest concentration and variety of identifiable mineral grains; these included quartz, microcline and plagioclase feldspars, muscovite, and a large amount of kyanite (Fig.
This report examines international trade and worldwide market trends pertaining to andalusite, kyanite and sillimanite.
Tenders are invited for Bhilai Steel Plant Intends To Procure 500 Mt Of Kyanite Ore (Al2o3 = 37%) With Following Specifications: Al2o3 = 37% Min.
This is supported by the lack of high-pressure minerals, such as kyanite, and mineral assemblages, such as orthopyroxenesillimanite.
Tenders are invited for Open Tender For 950 Tons Of Calcined Kyanite For Sru Ifico
Disthene Group's assets include a mining company that extracts Kyanite, a critical heat-resistant element incorporated in products ranging from spark plugs to space shuttle tiles, extensive landholding interests, and the Cavalier Hotel Corporation.
Kyanite, garnet, monazite, and amphibole are common minerals, while apatite, anatase, titanite, corundum, pyroxene, and epidote are rare.
Tenders are invited for Supply Of 900 Mt Raw Kyanite (Grade-2) To Sru-Ifico.
Zircon distribution is typical of acid hydrolysis; the layer diversity of the profile with respect to tourmaline, kyanite, staurolite, rutile, and sphene appears to be related not only to the weathering, but also to the initial heterogeneity of wind affected sediment.
The basal gravels are comprised of a clast supported gravel horizon comprised largely of well-sorted quartz cobbles and quartzite boulders, within a matrix of quartz-rich sands that host a visible concentration of heavy minerals such as gold, tourmaline, ilmenite, kyanite, topaz, and sapphire.
Although these samples were taken from glacial till, visual observation of the concentrates shows green chrome diopsides, kyanite, sapphires, rutile and anatase.
The basal gravels lie on bedrock consisting of fine grained quartzite, and comprise a 5 metre thick clast-supported gravel horizon comprised largely of well-sorted quartz clasts and quartzite boulders, within a matrix of quartz-rich sands that host a visible concentration of heavy minerals such as tourmaline, ilmenite, kyanite, topaz, and sapphire.