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GEOLOGY - MINERALS & VOLCANOES > PYROXENE > Flashcards

PYROXENE Flashcards

1
Q

pyroxene characteristics

A

(black quartz)

  • black, may be brownish green/bronze
  • stubby, prismatic crystals
  • two cleavage directions, intersecting ~90*
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2
Q

pyroxene occurrence

A

common in ultrabasic(ultramafic) to intermediate igneous rocks, also in acid (felsic) igneous rocks

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3
Q

clinopyroxene occurrence

A

common in basic(mafic) igneous rock.

blotchy grey in ppl:inclied extinction in xpl

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4
Q

orthopyroxene occurrence

A

common in acidic (felsic) igneous rocks

blotchy grey in ppl:parallel extinction in xpl

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GEOLOGY - MINERALS & VOLCANOES (25 decks)

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