GEOL 104 Study Guide - Midterm Guide: Continental Crust, Volcanic Rock, Pumice

• School: Queen's University
• Department: Geological Sciences and Geological Engineering
• Course: GEOL 104
• Professor: Daniel Layton- Matthews

Document Summary

Granite (continental crust) phaneritic: composed of about 20% quartz and about 65% or more feldspar may exhibit a porphyritic texture, the term granite covers a wide range of mineral compositions. Rhyolite: extrusive equivalent of granite, aphanitic texture, may contain glass fragments and vesicles less common and less voluminous than granite. Distributing prohibited | downloaded by scarlet choi (choia980806@gmail. com) lomoar cpsd| 1578061. Andesite (extrusive) volcanic origin: medium gray color, fine-grained, commonly exhibits porphyritic texture, may resemble rhyolite, making identification more difficult without a microscope.