Mineraller ve özellikleri Dolomit General Dolomite Information Chemical Formula: CaMg(CO3)2 Composition: Molecular Weight = 184.40 gm Calcium 21.73 % Ca 30.41 % CaO Magnesium 13.18 % Mg 21.86 % MgO Carbon 13.03 % C 47.73 % CO 2 Oxygen 52.06 % O ______ ______ 100.00 % 100.00 % = TOTAL OXIDE Empirical Formula: CaMg(CO3) 2 Name Origin: Named after the French mineralogist and geologist, D. de Dolomieu (1750-1801). Synonym: ICSD 31336 PDF 36-426 Dolomite Crystallography Axial Ratios: a:c = 1:3.29409 Cell Dimensions: a = 4.842, c = 15.95, Z = 3; V = 323.85 Den(Calc)= 2.84 Crystal System: Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3 X Ray Diffraction: By Intensity(I/I o): 2.883(1), 1.785(0.6), 2.191(0.5), Forms: [ 1 0 1] Physical Properties of Dolomite Cleavage: [1011] Perfect, [1011] Perfect, [1011] Perfect Color: White, Gray, Reddish white, Brownish white, Gray. Density: 2.8 - 2.9, Average = 2.84 Diaphaniety: Transparent to translucent Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. Habits: Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Massive - Uniformly indistinguishable crystals forming large masses., Blocky - Rhombohedral - Crystal shape resemb les rhomohedrons. Hardness: 3.5-4 - Copper Penny-Fluorite Luminescence: None. Luster: Vitreous (Glassy) Streak: white Optical Properties of Dolomite Optical Data: Uniaxial (-), e=1.5, w=1.679-1.681, bire=0.1790- 0.1810.