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Geology 211 > Optical Properties > Flashcards

Optical Properties Flashcards

1
Q

Isotropic Minerals (5)

A

Garnet, Sodalite, Spinel, Sphalerite, Fluorite

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2
Q

Minerals with very high birefringence (2)

A

Muscovite and Anhydrite

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3
Q

Three types of zoning

A

Hourglass, Core-rim, Oscillatory

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4
Q

Twinning made by all feldspars

A

Carlsbad

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5
Q

What kind of twinning does microline have?

A

Tartan

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6
Q

Twinning used to plagioclase feldspar determination.

A

Albite

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7
Q

Other plagioclase twinning

A

Pericline

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Geology 211 (6 decks)

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