Mineral Idenitifcation Ig Met

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Important minerals

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15 Terms

1
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Plagioclase

colorless, 2 cleavage planes 90, low relief, no pleochroism, inclined extinction, polytheistic twinning, and igneous and metamorphic

<p>colorless, 2 cleavage planes 90, low relief, no pleochroism, inclined extinction, polytheistic twinning, and igneous and metamorphic </p>
2
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Olivine

colorless pink or green, no cleavage, 3rd order interference colors, high relief, 90 extinction angles, no pleochromism, no twinning,

<p>colorless pink or green, no cleavage, 3rd order interference colors, high relief, 90 extinction angles, no pleochromism, no twinning, </p>
3
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Orthopyroxene

colorless pink—>green, 2 planes of cleavage, moderate to high relief, weak pleochromism, 1st order birefringence with parallel extinction, and fine twinning

<p>colorless pink—&gt;green, 2 planes of cleavage, moderate to high relief, weak pleochromism, 1st order birefringence with parallel extinction, and fine twinning </p>
4
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Hornblende

Green/brown, 2 planes of cleavage at 60/120, high relief, strong pleochromism, 2nd order birefringence, and inclined extinction

<p>Green/brown, 2 planes of cleavage at 60/120, high relief, strong pleochromism, 2nd order birefringence, and inclined extinction</p>
5
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Garnet

colorless, no cleavage, high relief, no pleochromism, isotropic, no extinction angle, no twinning, often metamorphic.

<p>colorless, no cleavage, high relief, no pleochromism, isotropic, no extinction angle, no twinning, often metamorphic.</p>
6
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Sillimanite

Colorless,1 cleavage plane, high relief, no pleochromism, 1st-2nd orderbirefringence, parallel extinction, no twinning, metamorphic

<p>Colorless,1 cleavage plane, high relief, no pleochromism, 1st-2nd orderbirefringence, parallel extinction, no twinning, metamorphic</p>
7
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Clinopyroxene

Colorless to light brown/green, 2+ cleavage planes at 90 degrees, Moderate to high relief, weak pleochroism, 2nd order birefringence, inclined extinction, sometimes twinning

<p>Colorless to light brown/green, 2+ cleavage planes at 90 degrees, Moderate to high relief, weak pleochroism, 2nd order birefringence, inclined extinction, sometimes twinning</p>
8
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Quartz

Colorless, No cleavage, Low relief, no pleochroism, 1st order birefringence, undulatory extinction type, no twinning, metamorphic

<p>Colorless, No cleavage, Low relief, no pleochroism, 1st order birefringence, undulatory extinction type, no twinning, metamorphic</p>
9
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K-Feldspar

Colorless, 2 planes @ 90 degrees, low relief, no pleochroism, 1st order Birefringence, parallel extinction, carlsbad twinning

<p>Colorless, 2 planes @ 90 degrees, low relief, no pleochroism, 1st order Birefringence, parallel extinction, carlsbad twinning</p>
10
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Chlorite

Green/blue to pale, Basal cleavage - 1 plane, low to moderate relief, Pleochroism, 1st order birefringence, parallel extinction, metamorphic

<p>Green/blue to pale, Basal cleavage - 1 plane, low to moderate relief, Pleochroism, 1st order birefringence, parallel extinction, metamorphic</p>
11
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Staurolite

colorless to yellow, no cleavage, high relief, strong pleochroism, 1st Order, parallel extinction, no twinning, and metamorphic

<p>colorless to yellow, no cleavage, high relief, strong pleochroism, 1st Order, parallel extinction, no twinning, and metamorphic </p>
12
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Muscovite

colorless to weak, 1 basal cleavage plane, no pleochroism, low relief, 2nd-3rd order birefringence, parallel extinction, and fine twinning.

<p>colorless to weak, 1 basal cleavage plane, no pleochroism, low relief, 2nd-3rd order birefringence, parallel extinction, and fine twinning.</p>
13
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Kyanite

colorless to weak, 2 planes of cleavage at 75-80 degrees, high relief, weak pleochroism, 1st order birefringence, inclined extinction, has twinning, and is metamorphic

<p>colorless to weak, 2 planes of cleavage at 75-80 degrees, high relief, weak pleochroism, 1st order birefringence, inclined extinction, has twinning, and is metamorphic </p>
14
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Biotite

brown/green to reddish brown with 1 basal cleavage plane, strong pleochroism, low to moderate relief, 2nd-3rd order birefringence, and fine twinning. It also has bird’s eye extinction.

<p>brown/green to reddish brown with 1 basal cleavage plane, strong pleochroism, low to moderate relief, 2nd-3rd order birefringence, and fine twinning. It also has bird’s eye extinction. </p>
15
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Calcite

Colorless or white mineral with 3 cleavage planes, high relief, no pleochromism, 4th order birefringence, and has symmetrical extinction, and twinning

<p>Colorless or white mineral with 3 cleavage planes, high relief, no pleochromism, 4th order birefringence, and has symmetrical extinction, and twinning</p>