Cat's Eye Pezzottaite

Cat's eye pezzottaite, muag li crimson los yog crimson beryl.

Yuav cov gemstones ntuj hauv peb lub khw gemstone

crimson miv qhov muag

Qhov no yog ib hom minerals tshiab. Kuv tau thawj zaug lees paub los ntawm International Mineralogical Society thaum lub Cuaj Hlis 2003. Pezzottaite yog cesium sib npaug ntawm beryllium. Cesium silicate, nrog rau beryllium, lithium thiab txhuas. Nrog rau cov tshuaj formula Cs(Be2Li)Al2Si6O18.

Lub npe tom qab Italian geologist thiab mineralogist Federico Pezzotta. Pezzottaite yog thawj zaug xav tias yog liab beryl. Los yog ntau yam tshiab ntawm beryllium: cesium beryllium. Txawm li cas los xij, tsis zoo li beryllium tiag, pezzottaite muaj lithium thiab crystallizes. Nws yog nyob rau hauv ib tug trigonal crystal system, tsis yog ib tug hexagonal.

Cov txheej txheem xim muaj xws li ntxoov liab crimson, txiv kab ntxwv liab thiab liab dawb. Nws yog mined los ntawm merolithic quarries nyob rau hauv granite pegmatite deposits ntawm lub xeev ntawm Fianarantsoa nyob rau hauv sab qab teb ntawm Madagascar. Cov pezzottaite muaju yog me me, tsis loj dua li 7 cm / 2.8 ntiv tes, ntawm lawv qhov loj tshaj plaws, thiab muaj ib daim duab los yog sib npaug.

Thiab qee qhov, feem ntau ntawm lawv muaj kev cuam tshuam nrog txoj kev loj hlob thiab cov plaub hau. Kwv yees li 10 feem pua ​​​​ntawm cov khoom ntxhib kuj dhau los ua cov lus tom qab polishing. Feem ntau pezzottaite txiav gemstones hnyav dua ib carat (200 mg) thiab tsis tshua muaj tshaj ob carats / 400 mg.

Cat's eye pezzottaite kev txheeb xyuas

Tsuas yog hardness 8 ntawm Mohs nplai. Lub cev thiab optical zog ntawm pezottaite, i.e. Lub ntiajteb txawj nqus 3.10, refractive index 1.601-1.620. Lub birefringence ntawm 0.008 txog 0.011 (tsis txwv tsis pub) yog siab dua li cov beryllium. Lub pezzottiat yog nkig, nrog lub plhaub tawg mus rau qhov tsis sib xws, nrog cov streaks dawb.

Zoo li beryl, nws muaj qhov tsis zoo los yog lub teeb cleavage ntawm lub hauv paus. Pleochroism yog nruab nrab, rose-txiv kab ntxwv los yog mauve rau rose-violet. Kev nqus spectrum ntawm pezzottaite, thaum saib nrog lub portable ncaj saib spectroscope, npog lub band nrog lub wavelength ntawm 485-500 nm. Qee cov qauv qhia ntxiv faint kab ntawm 465 thiab 477 nm thiab faint band ntawm 550-580 nm.

Feem ntau, yog tsis yog tag nrho, ntawm Madagascar cov deposits yog depleted. Pezzottaite tau pom nyob rau hauv tsawg kawg yog ib qhov chaw, Afghanistan: thaum xub thawj nws tau xav tias cov khoom no muaj ntau ntawm cesium morganite / liab beryllium.

Zoo li morganite thiab bixbite, pezzottaite ntseeg tau tias tshuav nws cov xim rau cov chaw xim hluav taws xob, suav nrog trivalent manganese. Pezzottaite yuav plam xim thaum rhuab mus rau 450 ° C rau ob teev. Tab sis xim tuaj yeem rov qab los siv gamma rays.

 Crimson-berylium cat-eye effect

Hauv gemology, chatter, chatter lossis miv lub qhov muag nyhuv, qhov no yog qhov cuam tshuam qhov muag pom pom hauv qee lub gemstones. Muab los ntawm Fab Kis "oeil de chat", lub ntsiab lus "miv lub qhov muag", kev sib tham yog vim yog cov qauv ntawm cov khoom siv, xws li hauv miv lub nplai tourmaline, los yog vim muaj fiber ntau los yog kab noj hniav hauv pob zeb, xws li chrysoberyl.

Cov deposits uas ua rau kev sib tham yog cov koob. Tsis muaj cov raj lossis fibers hauv cov qauv kuaj. Cov koob nyob rau hauv perpendicular mus rau miv lub qhov muag nyhuv. Lub koob kab sib chaws tsis sib haum tsuas yog ib qho ntawm peb lub orthorhombic axes ntawm chrysoberyl siv lead ua vim yog kev sib dhos hauv qhov kev taw qhia.

Lub phenomenon zoo li lub ci ntsa iab ntawm ib lub voj voog. Lub luminous band ntawm reflected lub teeb yog ib txwm perpendicular rau cov kev taw qhia ntawm cov fibers. Nyob rau hauv thiaj li yuav lub gemstone kom zoo tshaj plaws qhia cov nyhuv, nws yuav tsum tau nyob rau hauv daim ntawv ntawm ib tug cabochon.

Hloov nrog lub hauv paus tiaj tus, tsis tau txiav, nrog cov fibers lossis cov qauv fibrous sib npaug rau lub hauv paus ntawm cov pob zeb tiav. Cov qauv ua tiav zoo tshaj plaws qhia tau ib qho ntse. Ib txoj kab ntawm lub teeb hla lub pob zeb thaum nws tig.

Cov pob zeb tsis zoo Chatoyant pom cov nyhuv striated raug ntawm miv qhov muag ntau yam ntawm quartz. Lub ntsej muag pob zeb qhia cov nyhuv tsis zoo.

Cat's eye pezzottaite los ntawm Madagascar

Kev muag khoom ntawm ntuj pob zeb hauv peb lub khw gemstone