Index15501690 colorgreencolorlessblue pleochroismyes

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Unformatted text preview: c biaxial neg / pos Too ­Vee 0 ­ 60 ¡ relief.1 moderate to high pos min. index 1.550 / 1.690 color green, colorless, blue pleochroism yes birefringence.1 0.000 ­ 0.015 cleavage yes { cleavage on {001} controls fragment orientation elongation no extinction inclined angle 0 ­ 9¡ (cleavage) alteration fairly resistant to alteration, oxidation, clay habit.1 columnar, tabular, platy occurence metamorphic (low to medium grade), igneous (hydro ­ thermal), sedimentary TwoV 1 2 relief 2 3 pleochroism.2 green birefringence 1 2 3 4 5 6 7 cleavage.2 {001} perfect, controls fragment orientation...
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This document was uploaded on 02/25/2014.

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