Mineraller ve √∂zellikleri Azurit General Azurite Information Chemical Formula: Cu3(CO3)2(OH)2 Composition: Molecular Weight = 344.67 gm Copper 55.31 % Cu 69.24 % CuO Hydrogen 0.58 % H 5.23 % H 2 O Carbon 6.97 % C 25.54 % CO 2 Oxygen 37.14 % O ______ ______ 100.00 % 100.00 % = TOTAL OXIDE Empirical Formula: Cu3(CO 3) 2(OH) 2 Environment: Secondary mineral in the oxidized zone of copper ore deposits. IMA Status: Approved IMA 1980 Locality: Tsumeb near Otavi, Namibia. Link to MinDat.org Location Data. Name Origin: From the Persian lazhward, meaning "blue.". Synonym: Chessylite ICSD 2934 PDF 11-682 Azurite Crystallography Axial Ratios: a:b:c =0.8569:1:1.7686 Cell Dimensions: a = 5.008, b = 5.844, c = 10.336, Z = 2; beta = 92.333¬į V = 302.25 Den(Calc)= 3.79 Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a X Ray Diffraction: By Intensity(I/I o): 3.516(1), 2.224(0.7), 5.15(0.55), Forms: [ 0 1 1] [ 1 1 0] [ 1 0 2] [ 0 1 3] [ 1 0 0] [ 1 1 1] [ 0 0 1] Physical Properties of Azurite Cleavage: [011] Perfect, [100] Fair Color: Azure blue, Blue, Light blue, Dark blue. Density: 3.77 - 3.89, Average = 3.83 Diaphaniety: Transparent to subtranslucent Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. Habits: Tabular - Form dimensions are thin in one direction., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Stalactitic - Shaped like pendant columns as stalactites or s talagmites (e.g. calcite). Hardness: 3.5-4 - Copper Penny-Fluorite Luminescence: None. Luster: Vitreous (Glassy) Streak: light blue Optical Properties of Azurite Optical Data: Biaxial (+), a=1.73, b=1.758, g=1.838, bire=0.1080, 2V(Calc)=64, 2V(Meas)=68. Dispersion relatively weak.