Dolomite yog ib qho ntxhia thiab ib qho tseem ceeb carbonate pob zeb. Nws tuaj yeem siv tau ua ob qho tib si ntxhia thiab pob zeb lub npe.
Lub ntsiab lus tseem ceeb
Chemical Composition: CaMg(CO₃)₂, piv txwv li, calcium magnesium carbonate. Nws feem ntau muaj cov ntsiab lus xws li hlau thiab manganese, uas tuaj yeem hloov cov magnesium los tsim ntau yam xws li hlau dolomite thiab manganese dolomite.
Crystal Structure: Trigonal siv lead ua system. Cov Crystals feem ntau yog rhombohedral, thiab cov ntsej muag siv lead ua feem ntau yog nkhaus rau hauv lub eeb, uas yog qhov tshwj xeeb tshaj tawm cov yam ntxwv.
Lub cev muaj zog:
Xim: Feem ntau yog dawb lossis greyish -dawb, tab sis tuaj yeem tshwm liab, daj, lossis xim av vim yog impurities.
Luster: Vitreous mus pearly luster.
Hardness: 3.5 - 4 (Mohs hardness), harder dua ib tug ntiv tes, tab sis yooj yim khawb los ntawm riam.
Cleavage: Muaj peb pawg ntawm qhov zoo meej cleavage (rhombohedral cleavage).
Distinguishing Dolomite los ntawm Calcite: Dolomite yog yooj yim tsis meej pem nrog calcite (CaCO₃) nyob rau hauv tsos. Txoj kev txhim khu kev qha tshaj plaws ntawm kev txheeb xyuas yog siv txias, dilute hydrochloric acid:
Calcite: Effervesces nyob rau hauv txias, dilute hydrochloric acid.
Dolomite: hmoov dolomite reacts nrog txias, dilute hydrochloric acid, tab sis lumpy dolomite effervesces heev weakly los yog tsis nyob rau hauv tag nrho cov txias, dilute hydrochloric acid. Nws tsuas yog reacts vigorously nyob rau hauv rhuab hydrochloric acid.
