Anatase

Macluumaadka Gemstone

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Qeexidda Gemstone

Anatase

Iibso guntin dabiici ah dukaankeena


Anatase waa macdanta macdanta ee loo yaqaan 'dioxide titanium'. Macdanta qaababka dabiiciga ah waxaa badanaa lala kulmaa sidii wax madow oo madow, in kasta oo maadada saafiga ahi ay tahay midab la'aan ama caddaan. Laba qaab oo kale oo dabiici ah oo TiO2 ah ayaa loo yaqaan, brookite iyo rutile.

Anatase is always found as small, isolated and sharply developed crystals, and like the thermodynamically stable rutile, it crystallizes in the tetragonal system. The gemstone is metastable at all temperatures and pressures, with rutile being the equilibrium polymorph. Nevertheless, anatase is often the first titanium dioxide phase to form in many processes, due to its lower surface energy, with a transformation to rutile taking place at elevated temperatures. Although the degree of symmetry is the same for both anatase and rutile phases, there is no relation between the interfacial angles of the two minerals, except in the prism-zone of 45° and 90°. The common pyramid of anatase, parallel to the faces of which there are perfect cleavages, has an angle over the polar edge of 82°9′, the corresponding angle of rutile being 56°52½’. Due to this steeper pyramid,

Crystal caado

Two growth habits of anatase crystals may be distinguished. The more common occurs as simple acute double pyramids with an indigo-blue to black color and steely luster. Crystals of this kind are abundant at Le Bourg-d’Oisans in Dauphiné, where they are associated with rock-crystal, feldspar, and axinite in crevices in granite and mica-schist. Similar crystals, but of microscopic size, are widely distributed in sedimentary rocks, such as sandstones, clays, and slates, from which they may be separated by washing away the lighter constituents of the powdered rock. The plane of anatase is the most thermodynamically stable surface and is thus the most widely exposed facet in natural and synthetic anatase.

Kiristaalo nooca labaad waxay leeyihiin wajiyo badan oo ah pyramidal, waxayna had iyo jeer yihiin kuwo fidsan ama mararka qaar xabsi kujirta, midabku waa malab-huruud ilaa bunni. Kirismasyada noocan oo kale ah waxay u eg yihiin nabaad-guur muuqaal ah, runtiina, muddo dheer ayey ahayd inay ka tirsanaadaan noocani, magaca gaarka ah ee loo yaqaan 'smarterine' ayaa lagu dabaqay iyaga. Waxay ku dhacaan gidaarka dillaacyada ee xiidmaha Alps, Binnenthal oo u dhow Brig oo ku taal canton Valais, Switzerland, oo ah deegaan caan ku ah. Si dabiici ah oo uqimaya murqo goosadnimo ka dib dhicitaanka jirka ayaa sidoo kale loo yaqaan.

Anatase


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