Txiv kab ntxwv kyanite, los ntawm Tanzania

Txiv kab ntxwv kyanite Tanzania

Project Info

Project hauj lwm

Txiv kab ntxwv kyanite, los ntawm Tanzania

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Kyanite yog ib tug feem ntau xiav silicate mineral, feem ntau pom nyob rau hauv txhuas-nplua nuj metamorphic pegmatites thiab / los yog sedimentary pob zeb. Kyanite nyob rau hauv metamorphic pob zeb feem ntau qhia pressures siab tshaj plaub kilobars. Txawm tias muaj kev ruaj khov ntawm sab siab thiab tsawg kub, cov kev ua ntawm cov dej yog feem ntau yog siab txaus nyob rau hauv tej yam kev mob uas nws yog hloov los ntawm hydrous aluminosilicates xws li muscovite, pyrophyllite, los yog kaolinite. Kyanite no kuj hu ua disthene, rhaeticite thiab cyanite.

Kyanite yog ib tug tswv cuab ntawm lub aluminosilicate series, uas kuj muaj xws li cov polymorph andalusite thiab cov polymorph sillimanite. Kyanite yog xav anisotropic, nyob rau hauv uas nws hardness txawv nyob ntawm seb nws crystallographic kev taw qhia. Nyob rau hauv kyanite, qhov no anisotropism yuav suav hais tias ib qho uas peb cov yam ntxwv.

Thaum kub saum toj no 1100 ° C kyanite decomposes rau hauv mullite thiab vitreous silica ntawm cov hauv qab no cov tshuaj tiv thaiv: 3 (Al2O3 · SiO2) → 3Al2O3 · 2SiO2 + SiO2. Qhov no transformation tau nyob rau hauv ib tug expansion.

Nws lub npe los ntawm lub tib lub hauv paus chiv keeb li hais tias ntawm cov xim cyan, raug muab tau los ntawm cov Ancient Greek lo lus κύανος. Qhov no yog feem ntau nws ua lus Askiv raws li kyanos los yog kuanos thiab txhais tau tias "tsaus ntuj nti xiav".

Kyanite tau siv los ua ib lub semiprecious gemstone, uas tej zaum yuav tso miv lub qhov muag chatoyancy, txawm siv no yog txwv los ntawm nws cov anisotropism thiab zoo meej cleavage. Xim ntau yam xws li nyuam qhuav pom txiv kab ntxwv kyanite los ntawm Tanzania. Qhov xim xim txiv kab ntxwv yog vim muaj qhov me me ntawm manganese (Mn3 +) hauv tus qauv.

Identification

Kyanite's elongated, columnar crystals feem ntau yog thawj qhov zoo ntawm cov ntxhia, nrog rau nws cov xim (thaum hnoos qe yog xiav). Ua haujlwm cov zaub mov muaj txiaj ntsim zoo li, tshwj xeeb tshaj yog cov muaj cov polymorphs ntawm staurolite, uas tshwm sim nquag nrog kyanite. Txawm li cas los xij, qhov tseem ceeb tshaj plaws nyob rau hauv kev pom cov kyanite yog nws qhov anisotropism. Yog hais tias ib tug neeg ua txhaum ib qho qauv uas yog kyanite, xyuas tias nws muaj ob qhov sib txawv ntawm qhov sib txawv ntawm txoj kab sab nraud yog qhov tseem ceeb rau kev txheeb xyuas, nws muaj qhov nyuaj ntawm 5.5 mus tib seem rau {001} thiab 7 mus tib seem rau {100}

Txiv kab ntxwv kyanite, los ntawm Tanzania

yuav natural gemstones hauv peb lub khw

kev ua yuam kev: Cov ntsiab lus yog kev tiv thaiv !!