Ntawm cov zaub mov, feem ntau muaj cov khoom uas lawv xav tau tsis yog hauv kev lag luam xwb, tab sis kuj yog tshuaj thiab tshuaj pleev ib ce. Cov no suav nrog talc. Lub pob zeb no paub tsis yog pob zeb, tab sis ua hmoov rau me nyuam.
Oddly txaus, tab sis nyob rau hauv cov xwm nws yog yuav luag ob feem ntau tom qab quartz pob zeb. Nws yuav tsum tau muab sau tseg tias talc yog ib lub pob zeb nkaus xwb nyob rau hauv nws coarse-grained ntau yam, uas yog feem ntau hu ua steatite.
Nws cov xim txawv ntawm ntsuab mus rau dawb huv, thiab tsis hais qhov ntxoov ntxoo, nws tseem ceeb heev rau nws cov luster pearly. Nws yog mos heev thiab xav tias oily rau qhov kov. Ntawm Mohs nplai, nws qhov nyuaj yog ntsuas raws li "1" (theem tsawg kawg).
Nyob rau hauv nws daim ntawv ib txwm, nws yog ib tug oily coarse-grained hmoov, uas yog hu ua "talc". Lub pob zeb no yog dav vim hais tias cov xwm txheej ntawm nws tsim rau geology yog tus qauv heev.
Hais lus tshawb fawb, nws lub npe tshuaj yog acidic magnesium metasilicate H2Mg3 (SiO3)4. Nws crystallization tshwm sim hauv hom rhombic lossis monoclinic. Nyob rau hauv cov xwm, nws tshwm sim nyob rau hauv daim ntawv ntawm nplooj-zoo li tus los yog granularformations.
Los ntawm qhov pom ntawm geological, talc yog cov ntxhia hauv nruab nrab, raws li nws tau tsim tom qab cov tshuaj hloov pauv ntawm cov tsis yog txhuas magnesium silicates. Feem ntau amphibole lossis pyroxene raug cov metamorphoses.
Ntau zaus hauv qhov tsos nws tuaj yeem tsis meej pem nrog "niam txiv", vim nws khaws nws cov qauv crystalline nkaus xwb, txawv ntawm cov tshuaj muaj pes tsawg leeg.
Lub talc nws tus kheej, daim duab uas yog nyob rau hauv tsab xov xwm, muaj nuj nqis vim nws cov xim: lub whiter nws yog, qhov ntau cov khoom yog xav tau. Nws yuav tsum raug sau tseg tias tsuas yog cov talc tsawg tshaj plaws yog siv hauv kev lag luam, hauv av kom zoo heev.
Tsis tas yuav xav tias cov khoom no muaj nyob hauv cov xwm txheej hauv ib daim ntawv xwb. Muaj ntau ntau yam ntawm nws ib zaug, uas txawv heev nyob rau hauv lawv cov tshuaj muaj pes tsawg leeg thiab nyob rau hauv lub cev khoom:
- Minnesotaite (nws muaj txog li 50% hlau).
- Willemseit (xws li npib tsib xee).
- Steatite (uas feem ntau hu ua wen), muaj cov qauv tuab heev thiab loj heev.
- Agalite. Tsis zoo li nws cov thawj coj, nws zoo heev.
- Noble Talc: Ntau yam zoo tshaj plaws nrog cov xim dawb.
Feem ntau ntawm tag nrho cov talc yog mined hauv Asmeskas. Cov tsiaj no tau tsim nyob rau hauv ntau ntim hauv Brazil, Kaus Lim Qab Teb, Nyiv thiab Russia.
Yog li siv talc li cas? Lub pob zeb no tau pom daim ntawv thov ua hmoov, "gasket" ntawm cov khoom siv roj hmab, xws limuab tub lim, thiab kuj tau dav siv los ntawm perfumers thaum tsim tshiab ntau yam ntawm hmoov.
Tsuas yog nws tsim nyog tsim cov qauv zoo tshaj plaws ntawm cov tshuaj pleev ib ce zoo li no. Los ntawm txoj kev, cov kws txiav plaub hau tsuas yog siv "chalk", uas yog nyob ntawm tib talc. Nyob rau hauv kev lag luam, nws cov nplua-grained ntau yam yog siv nyob rau hauv kev tsim cov hluav taws xob insulators.
Nyob zoo, talc nqi npaum li cas? Niaj hnub no, nws tus nqi yog kwv yees li 1,000 rubles ib kilogram ntawm cov khoom siv hauv av zoo.
