Igneous Rocks Flashcards
0
Q
Which rocks often contain a vesicular texture?
A
Basalt and pumice
1
Q
What is an Equigranular texture?
A
All the crystals are of equal size but may all be fine, medium or coarse.
2
Q
What is the texture called when a vesicular texture is later Infilled?
A
Amygdoidal texture
3
Q
Suitable scale for a vesicular texture?
A
10mm per vesicle
4
Q
What is flow banding aligned parallel to?
A
The direction of flow
5
Q
which rock is flow banding common in?
A
Rhyolite
6
Q
What is a porphyry tic texture?
A
2 stages of cooling an results in 2 distinct sizes of crystals.
7
Q
What are the larger crystals in porphyritic textures called?
A
phenocrysts
