Igneous rocks Flashcards
Feature of igneous rocks?
Texture, Chemical composition
What are the different textures of a igneous rocks?
Phaneritic (Coarse + Visible to the eye), Aphanitic (Fine-grained, hard to see)
Phaneritic is an example of a ____ rock?
Intrusive.
Aphanitic is an example of ____ rock?
Extrusive.
What does extrusive refer to?
Extrusive refers to magma that cools VERY slow
What does intrusive refer to?
Intrusive refers to magma that explodes quickly
Felsic refers to?
A igneous rock that is light in color
Mafic refers to?
A igneous rock that is dark in color
What mineral is phaneritic and felsic?
Granite
What mineral is phaneritic and intermediate?
Diorite
What mineral is phaneritic and mafic?
Gabbro
What mineral is Aphanitic and felsic?
Rhyolite
What mineral is Aphanitic and intermediate?
Andesite
What mineral is Aphanitic and mafic?
basalt
Why is pumice/scoria hard to interpret?
Because of its air bubbles it looks phaneritic, but it’s categorized as Aphanitic and vesicular.
What is the only exception? (Mineral)
OBSIDIAN!
