Miv lub qhov muag kornerupine

Gemstone Info

Gemstone Nqe Lus

Miv lub qhov muag kornerupine

Yuav cov gemstones hauv ntuj hauv peb lub khw


Cat’s eye kornerupine is also called Prismatine. It is a rare boro-silicate mineral with the formula (Mg,Fe2+)4(Al,Fe3+)6(SiO4,BO4)5(O,OH)2. It crystallizes in the orthorhombic – dipyramidal crystal system as brown, green, also yellow to colorless slender tourmaline like prisms or in massive fibrous forms.
Ua ntej ntawm tag nrho cov, Nws muaj Mohs hardness ntawm 7. Lwm qhov, muaj lub nqus tshwj xeeb ntawm 3.3 txog 3.34. Txuas ntxiv mus, Nws qhov ntsuas ntawm qhov rov qab yog nα = 1.660 - 1.671, nβ = 1.673 - 1.683 thiab nγ = 1.674 - 1.684.

Nws tshwm sim nyob rau hauv boron-nplua nuj volcanic thiab tseem cov pob zeb uas txo tau cov pob zeb uas tau ua nyob rau qib siab metamorphism. Peb kuj pom tau tias nws nyob rau hauv metamorphosed anorthosite complexes.
Cat’s eye kornerupine is commonly found with sapphirine, also cordierite, spinel, corundum, tourmaline, grandidierite, dumortierite, kyanite, sillimanite, andalusite, biotite, phlogopite, magnetite, ilmenite, hematite, rutile.

Cat’s eye kornerupine is valuable as a gemstone when it is translucent green to yellow shades. The emerald green varieties are especially sought after. It forms a solid solution series with prismatine. Strongly pleochroic, it appears green or reddish brown when viewed from different directions. It has a vitreous luster.

Nws tau piav thawj zaug thaum xyoo 1884 txog kev tshwm sim hauv Fiskernæs hauv qab teb hauv Greenland. Lub npe kornerupine los ntawm Danish geologist, Andreas Nikolaus Kornerup (1857–1883). Nws tsis yog kom txog thaum xyoo 1912 uas pom cov khoom siv lub pov haum zoo. Nws tseem tsis tshua meej rau hnub no.

Miv lub qhov muag nyhuv

Hauv gemology, chatoyancy, kuj chatoyance lossis miv lub qhov muag nyhuv, yog qhov muag pom kev cuam tshuam uas pom hauv qee lub pov haum. Tsim los ntawm Fab Kis "oeil de chat", lub ntsiab lus "miv lub qhov muag", kev sib tham tshwm sim los ntawm cov txheej txheem fibrous ntawm cov khoom siv, xws li hauv miv lub qhov muag tourmaline, los ntawm fibrous inclusions los yog kab noj hniav tsis pub dhau lub pob zeb, raws li nyob rau hauv miv lub qhov muag chrysoberylCov. Cov kem tsev uas ua rau sib tham yog cov koob. Cov qauv ntsuas tau ua tiav tsis muaj cov pov thawj ntawm cov hlab los yog cov fibers.Qhov koob koob precipitates txhua kab teeb perpendicularly nrog kev cuam tshuam rau cov nyhuv no. Lub lattice parameter ntawm lub koob ntais ntawv tsuas yog ib qho ntawm peb orthorhombic siv lead ua axes ntawm lub chrysoberyl, raws li ib qho kev sib haum xeeb raws li qhov kev coj no.

Cov tshwm sim zoo li lub brilliance ntawm ib tug xoo lig xov. Lub luminous streak ntawm lub teeb pom kev zoo yog ib txwm txiav txim siab mus rau kev taw qhia ntawm cov fibers. Rau lub pov haum kom pom cov nyhuv no zoo dua, cov duab yuav tsum yog cabochon. Muab puag ncig nrog lub hauv paus tiaj, dua li lub ntsej muag, nrog cov leeg lossis cov qauv ua ib puag ncig rau lub hauv paus ntawm lub pov haum tiav. Cov nrws zoo tshaj plaws qhia tawm ib qho zuj zus. Ib pawg ntawm lub teeb uas txav mus hla lub pob zeb thaum nws hloov. Chatoyant pob zeb ntawm cov khoom tsis zoo zoo dua pom cov nyhuv banded zoo li yog cov raug nrog miv-qhov muag ntau yam ntawm quartz. Faceted pob zeb tsis qhia cov nyhuv zoo.

Cat’s eye kornerupine from India


Yuav cov gemstones hauv ntuj hauv peb lub khw

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