Demantoid

demantoid

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Demantoid

Yuav cov gemstones hauv ntuj hauv peb lub khw


Demantoid yog cov xim ntsuab ntau hom ntawm cov ntxhuav thiab ntxhov siab, ib tug tswv cuab ntawm pawg pab pawg ntawm cov zaub mov. Andradite yog calcium- thiab hlau nplua nuj garnet. Cov tshuaj formula yog Ca3Fe2 (SiO4) 3 nrog chromium hloov raws li qhov ua rau ntawm cov xim ntsuab (demantoid). Ferric Iron yog qhov ua rau ntawm daj hauv lub pob zeb.

Nws muaj cov misnomers olivine, thiab Uralian emerald.

Nyob rau thaj tsam 2003, cov ntawv tshaj tawm tau pib khiav tawm hauv cov lag luam tias qee cov Lavxias teb sab demantoid garnets tau niaj hnub ua rau kev kho cua sov kom rov zoo siab rau lawv cov xim. Xws li kev kho mob ntseeg tau tias yuav tsum tau ua nyob rau hauv tsawg dua kub thiab yog xav tias yuav tsum tsis paub los ntawm kev kuaj cov kev kuaj xeeb.

Qhov ntsuab ntau yam ntawm andradite garnet

Demantoid yog ntsuab ntau yam ntawm andradite garnet, yog li demantoids yog ib txwm muaj xim ntsuab (los ntawm txhais), tab sis qhov ntxoov ntxoo pes tsawg los ntawm ib qho muaj zog ntau daj daj ntsuab ze li ntawm cov xim zoo ntawm cov kab tho. Qee lub pob zeb muaj cov xim av daj, uas yog vim yog hlau. Nws cov kev tawg tawm (0.057) yog qhov txawv txawv, thiab qhov no feem ntau pom tau tias "hluav taws" (cov duab zaj sawv ntawm lub teeb xim), txawm hais tias qee qhov teeb meem lub pob zeb ntsuab lub cev xim tuaj yeem ua rau cov nyhuv no tsis tshua pom. Lawv cov lus yog adamantine. Demantoid tseem muaj qhov ua tau zoo ntawm qhov ntsuas ntawm 1.80 txog 1.89.

Demantoids feem ntau me me, nrog cov pob zeb tiav tas li hauv 1 carat (200 mg) thiab pob zeb dhau 2 carats (400 mg) yog tsawg. Pob zeb dhau 3 carats (600 mg) yog qhov tsawg kawg.

Lub pob zeb nrog ntau khaus ntawm xim ntsuab feem ntau yeej muaj nuj nqis, tab sis cov pob zeb ntawm cov xim daj daj daj tuaj tau ntau dua hluav taws. Kev xaiv ntawm pob zeb xim lossis hluav taws tuaj yeem yog qhov teeb meem ntawm tus kheej nyiam, nrog qee qhov preferring ntau yellowish-ntsuab pob zeb rau lub pob zeb ntsuab.

Khuv xim koj

Lavxias demantoid feem ntau muaj kev suav nrog ntawm chrysotile, uas yog hom ntawm asbestos. Cov xaim hluav taws xob no nthuav tawm los ntawm kev siv lead ua me me ntawm chromite. Cov kev suav nrog yog cov xov plaub feathery uas nyiam nkhaus thiab zoo li tus Tsov tus tw ntawm nees, thiab thiaj li raug xa mus rau horsetail inclusions. Hauv gemology, lub xub ntiag ntawm xws li suav hais tias yog kev kuaj 'kev kuaj' rau ntuj demantoid (piv txwv li cov suav no tsis pom nyob hauv lwm lub pov haum ntsuab. Qee lub pov haum muaj nuj nqis rau lawv cov kev sib ntxiv, thiab 'horsetails' tuaj yeem raug suav tias yog qhov xav tau hauv demantoid, raws li lawv tau coj los ua pov thawj ntawm cov npe neeg tseem ceeb hauv Lavxias, txawm hais tias qee tus demantoids los ntawm lwm qhov chaw (xws li Ltalis thiab Iran) kuj tseem muaj 'horsetails', uas tau suav hais tias yog tus xeeb ceem ntawm serpentinite geographic keeb kwm, thiab, ntawm qhov tod tes, tsis yog txhua tus Lavxias teb sab demantoids tiag tiag muaj 'horsetails'. Lub microstructure ntawm qee qhov kev ntseeg tau ntseeg tau hais tias cuam tshuam los ntawm qhov muaj 'horsetails' (tus 'horsetail' feem ntau yog pib ntawm qhov nruab nrab ntawm lub taub, nrog rau cov leeg tuaj tawm thiab radiating mus rau saum npoo), whereas horsetail-tsis muaj demantoids los ntawm lwm yam cov chaw qhia feem ntau tso ntsej muag ncaj qha.

Demantoid los ntawm Namibia


Yuav cov gemstones hauv ntuj hauv peb lub khw

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