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General Pyroxmangite Information Chemical Formula: (Mn,Fe++)SiO3 Composition: Molecular Weight = 131.20 gm Manganese 33.50 % Mn 43.25 % MnO Iron 8.51 % Fe 10.95 % FeO Silicon 21.41 % Si 45.79 % SiO2 Oxygen 36.58 % O ______ ______ 100.00 % 100.00 % = TOTAL OXIDE Empirical Formula: Mn 2+ 0.8 Fe 2+ 0.2 SiO 3 Environment: Metamorphic and contact metasomatism of Mn-bearing rocks. Forms a series with pyroxferroite IMA Status: Valid Species (Pre-IMA) 1913Physical Properties of Pyroxmangite Cleavage: {110} Perfect, {110} Perfect Color: Pink, Rose pink, Purplish pink, Yellowish red brown, Brown. Density: 3.8 Diaphaneity: Transparent to translucent Habit: Massive - Granular - Common texture observed in granite and other igneous rock. Habit: Massive - Uniformly indistinguishable crystals forming large masses. Hardness: 5.5-6 - Knife Blade-Orthoclase Luminescence: Non-fluorescent. Luster: Vitreous - Pearly Magnetism: Magnetic after heating Streak: white General Pyrosmalite-(Mn) Information Chemical Formula: (Mn,Fe++)8Si6O15(OH,Cl)10 Composition: Molecular Weight = 1,071.52 gm Manganese 29.74 % Mn 38.40 % MnO Iron 9.38 % Fe 12.07 % FeO Silicon 15.73 % Si 33.64 % SiO2 Hydrogen 0.56 % H 5.04 % H2O Chlorine 13.23 % Cl 13.23 % Cl - % Cl -2.99 % -O=Cl2 Oxygen 31.36 % O ______ ______ 100.00 % 99.40 % = TOTAL OXIDE Empirical Formula: Mn 2+ 5.8 Fe 2+ 1.8 Si 6 O 15 (OH) 6 Cl 4 Environment: Metamorphosed iron and manganese ores. Physical Properties of Pyrosmalite-(Mn) Cleavage: {0001} Good Color: Green blackish, Pale liver brown, Gray. Density: 3.06 - 3.19, Average = 3.12 Diaphaneity: Translucent to subtranslucent Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms. Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). Hardness: 4.5 - Between Fluorite and Apatite Luster: Vitreous (Glassy) Streak: brownish yellow General Pyrophyllite Information
