What textures are possible in extrusive rocks?
Aphanitic
Glassy
Vesicular
Phaneriti
Answer: Aphanatic, glassy and vesicular
Aphanatic because as it cools so fast the grains cannot grow that much size to be seen in naked eye.
Glassy texture we will find when the intrusion will take place under water and the cooling will be so fast. Obsidian is a variety of glassy texture.
Vesicular texture find because of removal of volatile matter from rock. Scoria, pumice, vesicular basalt etc.
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