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 ?
Find out more about Kyanite Publishing, Urban Gothic, Stephen Coghlan, and their other titles on their website at kyanitepublishing.com.
For the five years before the Kyanite settlement, the highest paid female shareholders were paid only fractions of what the highest paid shareholders made.
Kyanite deformation in whiteschist of the ultrahigh-pressure metamorphic Kokchetav Massif, Kazakhstan.
Specimens displayed include apatite, calcite, corundum, fluorite, gypsum, jadeite, kyanite, microcline, muscovite, quartz, sulfur, topaz, and tourmaline.
Alongside Discovery Networks Asia-Pacific, UKTV, the Infocomm Media Development Authority of Singapore (IMDA) and Perbadan Kemajuan Filem Nasional Malaysia (FINAS), BHP and Kyanite TV will bring viewers an exclusive look into the most remote regions of Borneo, the world's third largest island.
Metapelitic rocks containing staurolite commonly occur in medium-P regional metamorphism in the staurolite zone of the amphibolite facies, where staurolite is associated with almandine, muscovite, quartz and kyanite. However, staurolite-pelitic schists are not always encountered even though the P-T conditions lie within the stability field of staurolite, which led several petrologists to suggest that the bulk chemical composition plays an important role in the formation of staurolite in pelitic schists that are rich in [Al.sub.2][O.sub.3] and FeO and poor in [K.sub.2]O (e.g., Turner, 1968).
3 Felspar--Potash base Ogun, Kwari, Edo 4 Silica/Flint Lagos, Ogun, Edo 5 Dolomite Kwara 6 Kyanite Kaduna 7 Plaster--moulding Lagos, Edo, Sokoto Source: Irabor et al (1998) S/No Glaze Coating Materials Location 1 Felspar Ogun, Kogi, Edo 2 Quartz Ogun, Kogi, Edo 3 Zinc Oxide Ogun 4 Zircon Plateau 5 Calcium Carbonate Edo, Ogun 6 Barium Carbonate Plateau 7 Colour pigment Import
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For added exclusivity the cars can only be specified with a special colour palette chosen by Jaguar, including Polaris White, Spectrum Blue, Ultimate Black, Stratus Grey, Lunar Grey and Liquid Silver, plus Kyanite Blue and Salsa Red, colours unique to the XFR.
For added exclusivity the cars can only be specified with a special colour palette chosen by Jaguar designers, including Polaris White, Spectrum Blue, Ultimate Black, Stratus Grey, Lunar Grey and Liquid Silver, plus Kyanite Blue and Salsa Red which are colours unique to the XFR.
"Since the Black Pack and Speed Pack were launched on the XKR sports car at the Geneva Motor Show, almost half of XKR coupe buyers have selected one or both options - double our original estimate - and we expect the Black Pack will generate just as much excitement amongst XF customers." For added exclusivity the cars can only be specified with a special colour palette chosen by Jaguar designers, including Polaris White, Spectrum Blue, Ultimate Black, Stratus Grey, Lunar Grey and Liquid Silver, plus Kyanite Blue and Salsa Red which are colours unique to the XFR.
"Since the Black Pack and Speed Pack were launched on the XKR sports car at the Geneva Motor Show, almost half of XKR coupe buyers have selected one or both options and we expect the Black Pack will generate just as much excitement." The cars can only be specified with a colour palette chosen by Jaguar designers, including Polaris White, Spectrum Blue, Ultimate Black, Stratus Grey, Lunar Grey and Liquid Silver, plus Kyanite Blue and Salsa Red which are colours unique to the XFR.