Calcite vs Dolomite
Dolomite thiab calcite yog cov zaub mov uas muaj calcium carbonate. Ob qho no nyuaj rau qhov sib txawv ntawm ib leeg tshwj tsis yog qee yam khoom.
calcite
Calcite yog cov ntxhia, uas muaj calcium carbonate (CaCO 3). Qhov no yog ib tug nplua nuj ntxhia nyob rau hauv lub ntiaj teb nto. Calcite tuaj yeem tsim pob zeb, thiab lawv tuaj yeem loj hlob mus rau qhov loj me. Lawv muaj nyob rau hauv tag nrho peb hom pob zeb, uas yog sedimentary, igneous thiab metamorphic pob zeb. Ntau yam sib txawv ntawm calcites tuaj yeem tsim los ntawm kev hloov pauv hauv kev faib khoom thiab ib puag ncig. Lawv tuaj yeem tshwm sim raws li cov xim tsis muaj xim, lossis qee zaum tuaj yeem muaj xim dawb, paj yeeb, daj lossis xim av. Cov muaju tuaj yeem yog pob tshab, translucent lossis opaque, nyob ntawm cov khoom uas nws tau muab tso rau hauv thaum tsim. Tus nqi ntawm calcium carbonate muaj nyob rau hauv pob zeb tuaj yeem sib txawv. Qee zaum, muaj cov zaub mov calcite, uas muaj txog 99% calcium carbonate. Calcite muaj qhov tshwj xeeb kho qhov muag. Thaum lub teeb ci dhau los ntawm calcite ntxhia, nws qhia txog lub teeb ob. Tsis tas li ntawd, calcite muaj fluorescence, phosphorescence, thermo luminescence thiab triboluminescence zog. Nyob ntawm cov calcite ntau yam, qhov kev qhia ntawm cov khoom no yuav txawv. Calcites teb nrog cov kua qaub thiab tsim cov pa roj carbon dioxide. Tshwj xeeb tshaj yog nyob rau hauv dej, nws yuav tsawg soluble raws li qhov kub thiab txias, uas tso cai rau calcite rau precipitate thiab tsim ntau crystals. Calcites tsis tshua muaj zog, yog li lawv tuaj yeem khawb los ntawm tus ntiv tes. Calcite tuaj yeem pom hauv Ohio, Illinois, New Jersey, Tennessee, Kansas hauv Tebchaws Meskas thiab Lub Tebchaws Yelemees, Brazil, Mexico, England, Iceland, ntau lub tebchaws African thiab lwm yam.
Dolomite
Dolomite yog cov ntxhia uas muaj calcium magnesium carbonate CaMg (CO 3) 2 feem ntau. Dolomites tuaj yeem loj hlob mus txog qhov loj me uas tsim cov pob zeb hauv av, thiab qhov no yog pob zeb sedimentary tsim cov ntxhia. Dolomite yog dav faib thoob plaws ntiaj teb thiab feem ntau pom nyob rau hauv cov pob zeb sedimentary. Dolomite tuaj yeem cuam tshuam nrog cov kua qaub (tab sis tsis muaj zog heev). Thaum siv cov kua qaub kub los yog siv cov hmoov dolomite, cov tshuaj tiv thaiv tuaj yeem ceev ceev. Dolomite muaj pearly luster, uas yog tshwj xeeb. Muaj peev xwm muaj ob peb xim hauv dolomites, tab sis feem ntau muaj cov xim tsis muaj xim, paj yeeb thiab dawb. Crystals tuaj yeem yog pob tshab lossis translucent. Dolomite crystals muaj ib tug tshwj xeeb siv lead ua cwj pwm nrog ntse rhombohedrons los yog ib co nrog nkhaus ntsej muag. Dolomite muaj ib tug zoo meej cleavage los ntawm peb cov lus qhia raws li calcites. Raws li Mohs 'scale, lub hardness ntawm dolomite yog nyob ib ncig ntawm 3.5-4. Dolomite muaj ntau nyob rau hauv Canada, Switzerland, Mexico, Spain thiab nyob rau hauv Midwestern quarries ntawm teb chaws USA. Dolomite yog ntxiv rau cov av ua liaj ua teb, txhawm rau nce cov ntsiab lus magnesium thiab txo cov acidity. Nws kuj yog siv los ua ib lub pob zeb ornamental thiab ib qho kev sib sau ua ke.
Dab tsi yog qhov txawv ntawm Calcite thiab Dolomite?
• Calcite feem ntau muaj calcium carbonate thiab dolomite muaj calcium magnesium carbonate. Dolomite txawv ntawm calcite vim muaj magnesium.
• Calcite reacts sai nrog acids thiab tsim carbon dioxide npuas. Tab sis dolomite tsis muaj zog tiv thaiv nrog acids ua npuas maj mam. Thaum cov kua qaub kub los yog hmoov dolomite siv lawv yuav hnov mob sai.
• Dolomite yog ib qho nyuaj me ntsis thiab denser dua calcite.
• Calcites tsim scalenohedrons tab sis dolomites yeej tsis tsim scalenohedrons. Dolomite crystal cwj pwm sawv cev rau rhombohedrons los yog nkhaus ntsej muag.
