Mineraller ve √∂zellikleri Aktinolit General Actinolite Information Chemical Formula: Ca2(Mg,Fe++)5Si8O22(OH)2 Composition: Molecular Weight = 875.45 gm Calcium 9.16 % Ca 12.81 % CaO Magnesium 8.33 % Mg 13.81 % MgO Iron 12.76 % Fe 16.41 % FeO Silicon 25.66 % Si 54.91 % SiO 2 Hydrogen 0.23 % H 2.06 % H 2 O Oxygen 43.86 % O ______ ______ 100.00 % 100.00 % = TOTAL OXIDE Empirical Formula: Ca2Mg 3Si8O 22(OH)2Fe 2+ 2 Environment: Metamorphic rocks. Name Origin: From the Greek, aktinos, meaning "ray" in allusion to actinolite's fibrous nature. Synonym: Byssolite Hexagonite (Mn) ICSD 24900 Mountain Leather Nephrite Jade PDF 41-1366 Smaragdite - emerald green Actinolite Crystallography Axial Ratios: a:b:c =0.5436:1:0.2917 Cell Dimensions: a = 9.84, b = 18.1, c = 5.28, Z = 2; beta = 104.7¬į V = 909.61 Den(Calc)= 3.20 Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m X Ray Diffraction: By Intensity(I/I o): 8.38(1), 3.12(1), 2.71(0.9), Physical Properties of Actinolite Cleavage: [110] Perfect, [110] Perfect Color: Green, Green black, Gray green, Black. Density: 2.98 - 3.1, Average = 3.04 Diaphaniety: Translucent to transparent Fracture: Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende). Habits: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers. Hardness: 5.5 - Knife Blade Luminescence: Non-fluorescent. Luster: Vitreous (Glassy) Streak: white Optical Properties of Actinolite Optical Data: Biaxial (-), a=1.613-1.628, b=1.627-1.644, g=1.638- 1.655, bire=0.0250-0.0270, 2V(Calc)=78-82, 2V(Meas)=84-73. Dispersion r < v.