Limestone vs Dolomite
Ob leeg limestone thiab dolomite yog hom pob zeb ua los ntawm cov carbonate residues. Cov qauv ntawm txoj kev uas lawv coj chemically yuav luag tib yam nrog ntau yam siv. Txawm li cas los xij, cov qauv thiab kev tsim ntawm cov pob zeb no txawv heev.
Limestone
Limestone tsuas yog muaj ob hom minerals; uas yog, calcite thiab aragonite. Cov no yog ob hom sib txawv ntawm calcium carbonate nws tus kheej. Lub hauv paus ntawm cov calcium depositions feem ntau yog sab laug-over plhaub secretions/skeletal fragments ntawm marine kab mob xws li corals. Yog li, limestone yog ib hom pob zeb sedimentary tsim los ntawm kev tso cov khoom ntawm lub ntiaj teb saum npoo av los yog hauv dej. Sedimentation tuaj yeem tshwm sim ntawm qhov chaw ntawm qhov chaw lossis ntawm qhov chaw sib txawv kiag li. Yog tias nws nyob ntawm qhov chaw sib txawv, cov sediments raug thauj mus rau qhov chaw tso dej, cua, dej khov thiab lwm yam.
Limestone yog soluble hauv cov kua qaub tsis muaj zog feem ntau thiab qee zaum txawm nyob hauv dej. Nyob ntawm tus nqi pH ntawm dej, qhov kub thiab txias ntawm cov dej, thiab ion concentration, calcite yuav nyob twj ywm raws li precipitate los yog yaj. Yog li ntawd, limestone tsuas yog nyuam qhuav muaj sia nyob hauv dej thiab, thaum nyob hauv dej tob, nws dissolves vim dej siab. Feem ntau cov qhov tsua thaum ub tau tsim los ntawm kev yaig ntawm lub cev loj ntawm limestone los ntawm dej ntau txhiab lab xyoo. Av nplaum, silt thiab xuab zeb los ntawm cov dej ntws ua ke nrog cov khoom ntawm silica (los ntawm cov seem ntawm cov kab mob hauv hiav txwv) thiab hlau oxides yog cov feem ntau pom impurities hauv limestone. Vim muaj cov impurities nyob rau hauv ntau qhov sib txawv, lawv muaj xim sib txawv. Nyob ntawm txoj kev tsim nws tuaj yeem coj cov duab sib txawv ntawm lub cev; i.e. crystalline, granular, loj pob zeb hom.
Limestone yog nto moo tshaj plaws nyob rau hauv lub xyoo pua 19th thiab 20th vim hais tias muaj ntau lub tsev pej xeem thiab cov qauv tsim los ntawm limestone. Lub Great Pyramid ntawm Giza uas yog ib qho ntawm Xya Wonders ntawm lub ntiaj teb no kuj yog ua los ntawm limestone. Kingston, Ontario, Canada yog lub npe hu ua 'Limestone City' vim muaj ntau lub tsev tsim los ntawm limestone. Raws li cov khoom siv raw hauv kev tsim cov cement thiab mortar, crushed ua lub hauv paus ruaj khov rau txoj kev, ntxiv cov xim dawb hauv cov tshuaj, tshuaj pleev ib ce, tshuaj txhuam hniav, ntawv, yas thiab lwm yam yog ntawm ntau lwm yam kev siv limestone.
Dolomite
Dolomite kuj yog cov ntxhia carbonate tab sis yog ua los ntawm 'calcium magnesium carbonate' es tsis txhob siv cov khoom siv calcium carbonate ntshiab. Yog li ntawd, dolomite yog hu ua ob lub pob zeb carbonate, thiab nws tsis yooj yim yaj nyob rau hauv dilute acidic media. Txoj kev dolomite tsim tsis yog qhov tseeb, thiab nws tau pom tias nws tsim nyob rau hauv cov dej qab ntsev hauv ib puag ncig zoo li lagoons. Dolomite kuj yog ib hom pob zeb sedimentary. Thaum dolomite raug tsim, ob peb kauj ruam ntawm kev sib cais thiab rov los nag yog dhau qhov uas cov qauv ntawm cov pob zeb tau hloov mus rau hauv cov ntaub ntawv ruaj khov thiab crystallizes hauv trigonal-rhombohedral yam.
Dolomite crystals feem ntau yog xim dawb lossis greyish liab hauv cov xim, tab sis muaj qee yam impurities tuaj yeem hloov xim; i.e. Hlau nyob rau hauv dolomite muab nws ib tug yellowish xim av tint. Tsis tas li ntawd, cov hlau xws li Lead thiab Zinc tuaj yeem hloov magnesium hauv cov qauv ntxhia. Dolomite yog siv los ua ornamental kho kom zoo nkauj, raws li ib qho chaw rau magnesium extraction, ua pob zeb, nyob rau hauv horticulture ntxiv nplua nuj nyob rau hauv cov av los ntawm ntsuas pH ntawm av thiab lwm yam.
Dab tsi yog qhov txawv ntawm Limestone thiab Dolomite?
• Limestone yog calcium carbonate ntxhia whereas dolomite yog ua los ntawm calcium magnesium carbonate.
• xuab zeb, av nplaum thiab silt feem ntau pom nyob rau hauv limestone li impurities tab sis tsis tshua muaj nyob rau hauv dolomite.
• Calcite limestone feem ntau kim dua dolomite.
Nyeem ntxiv:
1. Qhov txawv ntawm Crystallization thiab nag lossis daus
2. Qhov txawv ntawm Calcite thiab Dolomite
3. Qhov txawv ntawm Gypsum thiab Limestone
4. Qhov txawv ntawm Limestone thiab Sandstone
5. Qhov txawv ntawm Limestone thiab Marble
6. Qhov txawv ntawm Metamorphic Pob Zeb thiab Sedimentary Pob Zeb
