Book Notes-Physical Properties of Minerals

Book Notes-Physical Properties of Minerals - Introduction

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Introduction Controlled by chemical and structural composition Mass-Dependent Properties o Density Mass per unit volume (g/cm3) o Specific Gravity Density of material/ density of water (1g/cm3) Controls on Density and Specific Gravity Packing index- measure how tight ions packed PI = V1/Vc x 100 (tot vol/ unit cell vol) Most minerals PI = 35-74 % PI higher when formed at high pressures High atomic weight-> high density and sp. Grav. Measurement of Specific Gravity Jolly Meter Weighs sample in water and air o G = Ma/(Ma-Mw) Pynchometer- measures if sample to small for Jolly balance-  flask (stopper w/ hole) weigh mineral- weigh pynchometer filled w/ water-put  sample in pynch- weigh pynch w/ sample (Mp+s)
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G= Ma/(Ma+Mp-Mp+s) Can compare to liquids w/ known G Properties Related to Mechanical Cohesion Hardness o Affected by weathering o Indentation Hardness Plunger w/ hard tip pressed on mineral- indention obs. Vicker’s most common Load applied/ SA of indentation = VHN Variability b/w Mohs and Vickers Tenacity Behavior of minerals when deformed or broken o Brittle Breaks or powders easily (ionic bonds) o Malleable Can be pounded into thin sheets ( metallic bonds) o Ductile Can be drawn into wire  o Sectile Can be cut with knife (few exist) o Elastic
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This note was uploaded on 09/26/2010 for the course GEO 416k taught by Professor Staff during the Fall '08 term at University of Texas at Austin.

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Book Notes-Physical Properties of Minerals - Introduction

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