Qhov sib txawv tseem ceeb ntawm calcite thiab aragonite yog qhov siv lead ua ntawm calcite yog trigonal, whereas lub crystal system ntawm aragonite yog orthorhombic.
Ob qho tib si calcite thiab aragonite yog ob hom sib txawv ntawm tib lub ntsiab lus, piv txwv li, calcium carbonate (CaCO 3). Txij li lawv yog cov qauv sib txawv ntawm tib cov tshuaj sib xyaw, peb hu lawv cov polymorphs. Txawm li cas los xij, lawv muaj lub cev sib txawv.
calcite yog dab tsi?
Calcite yog polymorph ruaj khov tshaj plaws ntawm calcium carbonate. Nws yog carbonate mineral. Nws cov crystal system yog trigonal. Ntxiv mus, nws feem ntau tsis muaj xim lossis dawb, tab sis qee zaum nws tuaj yeem ua grey, daj lossis ntsuab ib yam nkaus. Cov luster ntawm cov ntxhia no yog vitreous rau pearly ntawm qhov chaw cleavage thaum cov ntxhia streak yog dawb.
Calcite ntxhia muaj qhov nyuaj heev; nws Mohs hardness tus nqi yog 3. Qhov tshwj xeeb lub ntiajteb txawj nqus ntawm calcite yog 2.71. Ntxiv mus, cov ntxhia no tuaj yeem ua pob tshab lossis opaque. Qee zaum nws yuav pom phosphorescence lossis fluorescence. Ib qho crystals ntawm calcite qhia birefringence; Yog tias peb soj ntsuam ib yam khoom los ntawm cov siv lead ua no, nws tshwm ob npaug.
Daim duab 01: Pom ntawm Calcite
Tsis tas li ntawd, calcite tuaj yeem yaj hauv ntau cov kua qaub. Ib yam li ntawd, nws tuaj yeem yaj hauv av. Qee zaum, nws tau los nag los ntawm cov dej hauv av; Txawm li cas los xij, yam xws li kub thiab pH ntawm cov dej hauv av muaj kev cuam tshuam rau cov nag lossis daus no. Ntxiv mus, kev tsim kho kev lag luam yog cov neeg siv khoom tseem ceeb ntawm calcite; lawv siv cov pob zeb no hauv daim ntawv limestone thiab marble los tsim cov cement thiab pob zeb. Tsis tas li ntawd, microbiologically precipitated calcite muaj ntau yam kev siv nrog rau kev kho av, av stabilization thiab kev kho pob zeb.
Aragonite yog dab tsi?
Aragonite yog ib qho ruaj khov polymorph ntawm calcium carbonate. Cov ntxhia no yog tsim los ntawm cov nag lossis daus los ntawm cov dej hiav txwv thiab dej tshiab. Cov qauv siv lead ua ntawm cov pob zeb no yog orthorhombic. Aragonite feem ntau tshwm sim hauv cov ntawv columnar lossis fibrous. Muaj peev xwm sib txawv xim aragonite minerals: dawb, liab, daj, txiv kab ntxwv, ntsuab, ntshav, thiab lwm yam.
Daim duab 02: Qhov tshwm sim ntawm Aragonite
Cov pob txha ntawm cov pob zeb no yog subconchoidal. Nws hardness hauv Mohs nplai yog nruab nrab ntawm 3.5 txog 4.0. Nws lub ntiajteb txawj nqus yog 2.96. Thaum xav txog cov lustre, nws muaj vitreous, resinous ntawm pob txha tawg. Ntxiv mus, nws cov ntxhia streak yog dawb.
Tseem ceeb dua, cov pob zeb no yog qhov ntsuas kub tsis ruaj khov ntawm qhov ntsuas kub thiab siab. Yog li ntawd, nws zoo li hloov mus ua calcite ntawm cov nplai ntawm 10 7 rau 108 xyoo. Qhov ntawd txhais tau tias; Calcite ruaj khov dua aragonite. Thaum xav txog kev siv cov ntxhia no, nws yog qhov tseem ceeb rau kev rov ua dua ntawm cov kab mob reef hauv aquaria. Tsis tas li ntawd, nws khaws cov pH ntawm cov dej hiav txwv ze rau nws qib ntuj.
Kev sib raug zoo ntawm Calcite thiab Aragonite yog dab tsi?
- Calcite thiab aragonite yog polymorphs ntawm calcium carbonate.
- Ntawm qhov chaw saum npoo av, aragonite spontaneously hloov mus ua calcite dhau lub sijhawm geological.
Qhov txawv ntawm Calcite thiab Aragonite yog dab tsi?
Calcium carbonate muaj peb polymorphs: calcite, aragonite thiab vaterite. Qhov sib txawv tseem ceeb ntawm calcite thiab aragonite yog qhov siv lead ua ntawm calcite yog trigonal, hos cov siv lead ua ntawm aragonite yog orthorhombic. Kuj tseem muaj qhov sib txawv ntawm calcite thiab aragonite nyob rau hauv cov nqe lus ntawm stability. Calcite yog polymorph ruaj khov tshaj plaws ntawm calcium carbonate. Txawm hais tias aragonite tseem yog polymorph ruaj khov, nws tsis ruaj khov li calcite.
Hauv qab infographic muab cov ntsiab lus ntxiv txog qhov sib txawv ntawm calcite thiab aragonite.
Summary – Calcite vs Aragonite
Calcite thiab aragonite yog polymorphs ntawm calcium carbonate. Qhov sib txawv tseem ceeb ntawm calcite thiab aragonite yog qhov siv lead ua ntawm calcite yog trigonal, hos cov siv lead ua ntawm aragonite yog orthorhombic. Ntxiv mus, calcite ruaj khov dua aragonite.
