Mineraller ve özellikleri Aragonit General Aragonite Information Chemical Formula: CaCO3 Composition: Molecular Weight = 100.09 gm Calcium 40.04 % Ca 56.03 % CaO Carbon 12.00 % C 43.97 % CO 2 Oxygen 47.96 % O ______ ______ 100.00 % 100.00 % = TOTAL OXIDE Empirical Formula: Ca(CO3) IMA Status: Approved IMA 1963 Locality: Aragon (Spain). Link to MinDat.org Location Data. Name Origin: Named after its locality. Synonym: ICSD 15194 Nicolsonite (Zn) PDF 41-1475 Tarnowitzite (Pb) Aragonite Crystallography Axial Ratios: a:b:c =0.6223:1:0.7205 Cell Dimensions: a = 4.959, b = 7.968, c = 5.741, Z = 4; V = 226.85 Den(Calc)= 2.93 Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmcn X Ray Diffraction: By Intensity(I/I o): 3.396(1), 1.977(0.65), 3.273(0.52), Forms: [ 0 0 1] [ 0 1 1] [ 0 1 0] [ 1 1 0] Physical Properties of Aragonite Cleavage: [010] Distinct Color: Colorless, White, Gray, Yellowish white, Reddish white. Density: 2.93 Diaphaniety: Transparent to translucent Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. Habits: Pseudo Hexagonal - Crystals show a hexagonal outline., Columnar - Forms columns, Fibrous - Crystals made up of fibers. Hardness: 3.5-4 - Copper Penny-Fluorite Luminescence: None. Luster: Vitreous (Glassy) Streak: white Optical Properties of Aragonite Optical Data: Biaxial (-), a=1.529-1.53, b=1.68-1.682, g=1.685- 1.686, bire=0.1560, 2V(Calc)=16-18, 2V(Meas)=18- 19. Dispersion weak, r < v.