Mineraller ve özellikleri Akemanit General Akermanite Information Chemical Formula: Ca2MgSi2O7 Composition: Molecular Weight = 272.63 gm Calcium 29.40 % Ca 41.14 % CaO Magnesium 8.92 % Mg 14.78 % MgO Silicon 20.60 % Si 44.08 % SiO 2 Oxygen 41.08 % O ______ ______ 100.00 % 100.00 % = TOTAL OXIDE Empirical Formula: Ca2Mg(Si 2O 7) Environment: A product of contact metamorphism of siliceous limestones and dolostones, and in rocks of the sanidinite facies. Also, forms from alkalic magmas rich in calcium. Name Origin: For Anders Richard Akerman (1837-1922), Swedish metallurgist. Synonym: ICSD 39924 PDF 35-592 Akermanite Crystallography Axial Ratios: a:c = 1:0.63903 Cell Dimensions: a = 7.84, c = 5.01, Z = 2; V = 307.94 Den(Calc)= 2.94 Crystal System: Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: P 42 1m X Ray Diffraction: By Intensity(I/I o): 2.87(1), 1.76(0.3), 3.09(0.3), Physical Properties of Akermanite Cleavage: [001] Distinct, [110] Indistinct Color: Colorless, Grayish, Green, Brown. Density: 2.944 Diaphaniety: Transparent to Translucent Hardness: 5-6 - Between Apatite and Orthoclase Luster: Vitreous - Resinous Streak: white Optical Properties of Akermanite Optical Data: Uniaxial (+), w=1.632, e=1.64, bire=0.0080.