Igneous Rock Textures 4.0 / 5 based on 1 rating ? AllUniversityAll boards Created by: Jason BrowneCreated on: 22-04-13 04:15 10352816947 Across 1. mineral grains are all roughly the same size (12) 4. Pieces ejected from a volcanic eruption. (6) 5. rocks dominated by light coloured minerals. Rock normally dominated by quarts, feldspars and muscovites. (12, 4) 7. minerals show a gradation in grain size. Goes from small to large. (7) Down 2. vesticles in rock are filled with a secondary mineral introduced after the consolidation of the rock. (12) 3. Rocks dominated by dark coloured minerals. (10, 5) 6. Rock contains many cracks due to the contraction during cooling. Normally formed in natural glass (8) 8. a pyroclast which composition indicates ejection as a solid. (5) 9. rock is uniform in appearance showing no real structural features. (7) 10. fine texture where crystals are only visible under a microscope. Indicates rapid cooling. (9)
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