Mica nyob qhov twg?
Sep 20, 2023
Mica yog ib qho ntxhia tshwm sim nyob rau hauv ntau yam geological ib puag ncig thoob ntiaj teb. Nws yog cov ntxhia silicate, uas txhais tau hais tias nws muaj silicon thiab oxygen atoms khi ua ke hauv cov qauv siv lead ua. Mica feem ntau pom muaj nyob rau hauv cov pob zeb igneous thiab metamorphic, thiab tshwj xeeb tshaj yog muaj nyob rau hauv qee hom metamorphic pob zeb, xws li gneiss, schist, thiab phyllite.
Mica muaj nyob thoob plaws ntiaj teb, suav nrog Africa, Is Nrias teb, Australia, Brazil, Tebchaws Asmeskas thiab Canada. Cov neeg tsim khoom loj tshaj plaws yog Is Nrias teb, ua raws li Tebchaws Meskas, Brazil thiab Africa. Is Nrias teb yog lub teb chaws uas muaj peev xwm loj tshaj plaws ntawm mica flakes hauv ntiaj teb, suav txog kwv yees li 60% ntawm lub ntiaj teb tag nrho.
Hauv Is Nrias teb, mica yog mined feem ntau hauv cov xeev ntawm Jharkhand thiab Bihar. Ob lub xeev no yog lub hauv paus loj ntawm mica hauv Is Nrias teb vim lawv muaj cov pob zeb loj tshaj plaws ntawm mica-cov kabmob. Mica deposits nyob rau hauv Jharkhand thiab Bihar yog tsim los ntawm metamorphism ntawm sedimentary pob zeb (tsuas yog shales) thiab muaj mica minerals nyob rau hauv lawv mineralogy.
Hauv Tebchaws Meskas, mica yog mined hauv Appalachian Roob ntawm sab hnub tuaj Tebchaws Meskas, feem ntau hauv North Carolina, Georgia, thiab Virginia. Hauv cov xeev no, mica pom feem ntau hauv pegmatites, cov pob zeb tsis muaj zog uas muaj cov pob zeb loj ntawm ntau yam minerals. Cov mica pom nyob rau hauv cov pegmatites feem ntau yog nyob rau hauv daim ntawv ntawm muscovite, feem ntau mica mineral.
Hauv Brazil, mica yog mined hauv xeev Minas Gerais thiab Bahia. Hauv cov xeev no, mica muaj nyob rau hauv schists thiab gneiss tsim los ntawm metamorphism ntawm sedimentary pob zeb.
Hauv Africa, mica yog mined hauv Mozambique, Tanzania thiab Madagascar. Cov teb chaws no muaj lub ntiaj teb coob reserves ntawm mica, uas muaj nyob rau hauv metamorphic thiab igneous pob zeb.
Hauv Australia, mica yog mined feem ntau hauv Western Australia. Mica muaj nyob rau hauv ntau yam pob zeb, nrog rau schist, gneiss, thiab pegmatite.
Mica yog cov ntxhia tseem ceeb heev vim nws siv ntau yam kev lag luam los ntawm cov khoom siv hluav taws xob mus rau cov tshuaj pleev ib ce. Nws kuj yog siv los ua cov khoom siv rwb thaiv tsev hauv kev tsim kho kev lag luam. Mica yog dav siv thiab pom nyob rau hauv ntau yam geological ib puag ncig thoob ntiaj teb.
