In a porphyritic volcanic rock, which mineral grains are the last to crystallize?
A) phenocrysts
B) vesicles
C) pegmatites
D) matrix or groundmass
Correct Answer:
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Q57: Which of the following are used for
Q58: The main factors which directly govern the
Q59: Light coloured aphanitic rocks _.
A)always form deep
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Q64: The aphanitic equivalent of peridotite is
A)komatiite
B)andesite
C)basalt
D)rhyolite
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A)gabbro
B)granite
C)diorite
D)peridotite
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