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Studiehandbok_del 2_200708 i PDF Manualzz

Jag förstår att retardationen är minskande hastighet, alltså negativ acceleration. Jag vet också att formeln för att räkna ut medelacceleration är a = v/t. Physical mineralogy. Physical mineralogy is concerned with the physical properties and descriptions of minerals. Minerals can be described using several physical attributes, including hardness, specific gravity, luster, color, streak, and cleavage. The hardness of a mineral can be determined by a scratch test. mineralogy output, consequently yielding better porosity and water saturation calculation.

Retardation formula in mineralogy

% MolWt oxide Moles oxide Moles cation Mole oxygen SiO 2 59.85 60.086 0.996* 0.996 2*0.996 = 1.992 MgO 40.15 40.312 0.996 0.996 0.996 Total 100 2.998 * 59.85/60.086 ! Mole ratio Mg:Si:O = 1:1:3 ! Formula: MgSiO 3: enstatite The interference color or retardation is determined by the thickness of the mineral and by the difference in the indices of refraction (this is called the birefringence). Isotropic substances are black, that is no separation.

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. if “ Mar 27, 2010 The birefringence for a mineral in a thin section can also be determined using the equation for retardation, which relates thickness and Chemical Formula: OPTICAL PROPERTIES. Color in PPL: RI: Retardation: Birefringence: Optic Type/ Sign: 2V: Other (texture, extinction angle, twinning):. Addition of a retardation plate or compensator to the polarized light microscope The terms (refractive index and thickness) on the right side of the equation are Birefringence is the optical property of a material having a refractive index that depends on the of the crystal is seen as additive (blue retardation color) when aligned parallel Birefringence is widely used in mineralogy to iden (c) Triclinic: no coincidence except by chance.

Studiehandbok_del 2_200708 i PDF Manualzz

Lecture 12: Tectosilicates. Lecture 13: Elemental Chemistry. Lecture 14: Paulings Rules. Lecture 15: Bonding and Packing. Lecture 16: Mineral Formulas 1. Lecture 17: Mineral Formulas II. Lecture 18: Retardation and Interference Figures The Okélobondo natural fission reactor, southeast Gabon: Geology, mineralogy, and retardation of nuclear-reaction products.

63 formula corresponding to 40% schorl, 25% dravite, 20% foitite, and 15% olenite on a molar 64 basis. Use of spreadsheets like that of Selway and Xiong (2002) does a fine job of calculating the 65 atomic formula and assigns the name “schorl” to the phase. This mineral database was the first full mineral database on the Internet. In the 1980s I was at the Department of Mineralogy of Geneva Natural History Museum and the secretary accepted to type - during months!
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2018-08-14 EXAMPLE 1: WEIGHT PERCENT TO FORMULA Oxide wt. % MolWt oxide Moles oxide Moles cation Mole oxygen SiO 2 59.85 60.086 0.996* 0.996 2*0.996 = 1.992 MgO 40.15 40.312 0.996 0.996 0.996 Total 100 2.998 * 59.85/60.086 ! Mole ratio Mg:Si:O = 1:1:3 !

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To determine pleochroic formula, … Retardation: (( = i.(if “i” is a whole number, the waves are considered in phase. if “i” is a fraction, the waves are considered out of phase (Fig. 4). Constructive (Fig. 4a & b) vs. destructive interference (Fig.