Cov khoom
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Raws li thaum ntxov raws li nyob rau hauv ancient sij hawm, thaum tib neeg thaum ub tau noj los ntawm hiav txwv, lawv pom cov pearls dawb nrog cov yeeb yuj halo, thiab tau attracted los ntawm nws cov siv lead ua splendour. Txij thaum ntawd los, pearls tau dhau los ua neeg nyiam cov khoom siv, thiab tau raug xa mus rau hnub no.
Muaj nuj nqi
Cov inorganic Cheebtsam ntawm pearl feem ntau yog calcium carbonate thiab magnesium carbonate, accounting rau ntau tshaj 91%, ua raws li silicon oxide, calcium phosphate, Al2O3 thiab Fe2O3.
Organic teeb meem hauv pearl muaj aspartate, threonine, serine, glutamic acid, glycine, alanine, cystine, valine, methionine, isoleucine, leucine, tyrosine, phenylalanine, histidine, arginine, proline thiab lwm yam 17 hom amino acids. Tsis tas li ntawd, nws kuj muaj ntau tshaj 30 hom kab kawm, taurine, nplua nuj vitamins, peptides.
Pearls tuaj nyob rau hauv ntau daim duab, puag ncig, pears, qe, teardrop, khawm thiab txhua yam, uas puag ncig yog qhov zoo tshaj plaws. Heterogeneous.
Xim muaj xim dawb, liab dawb, lub teeb daj, lub teeb ntsuab, lub teeb xiav, xim av, mauve, dub thiab lwm yam, feem ntau yog dawb.
Dawb streaks. Nws muaj ib tug raug pearl luster, mos luster thiab iridescent xim. Pob tshab rau translucent. Refractive index 1.530-1.686, birefringence: aggregate ntsuas tsis tau. Tsis muaj dispersion. Hardness 2.5-4.5. Qhov ntom ntawm cov pearls dej ntshiab feem ntau yog 2.66-2.78g/cm, uas txawv ntawm qhov chaw mus rau qhov chaw. Tsis muaj cleavage. Zoo toughness. Nyob rau hauv luv luv yoj ultraviolet lub teeb, dawb pearl yog lub teeb xiav rau lub teeb daj. daj thiab kub pearls yog daj-ntsuab, ntsuab-xim av mus rau tsaus xim av; Cov pearls dub feem ntau yog paj yeeb rau txiv kab ntxwv-liab; X-rays fluoresce yellowish dawb. Foaming nrog hydrochloric acid.
Koj Tseem Yuav Zoo Li
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