Discussion
.............................. is a microstructure of glassy basaltic rocks characterised by radiating aggregates of fibrous crystal.
Answer: C
This microstructure is variolitic.
A variolitic texture consists of varioles, small rounded spherulites of radiating fibrous crystals (usually plagioclase or pyroxene), set in glassy or fine-grained basalt. It forms by rapid crystallisation of quickly chilled lava, as in the rims of pillow lavas.
A vugh is a small cavity in a rock, and a vesicle is a gas bubble cavity in lava; neither is made of crystals. Tektites are natural glass bodies produced by meteorite impacts.
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