Igneous Rocks

Question 1

Texture: Aphanitic (too small too see)
visible minerals: too small
F/M/I: felsic (light pink color)
cooling rate (fast)

Answer 1

Rhyolite

Question 2

Texture: Porphyritic (large surrounded by small)
visible minerals: amphibole
F/M/I: Intermediate (grayish color)
cooling rate: slow then fast (big surrounded by small)

Answer 2

Andesite Porphyry

Question 3

Texture: glassy
visible minerals: N/A
F/M/I: Mafic
cooling rate: very fast

Answer 3

obsidian

Question 4

texture: phaneritc (large crystals)
visible minerals: pyroxene (black and blocky)
F/M/I: ultramafic
cooling rate: slow (can see the crystals)

Answer 4

pyroxenite

Question 5

texture: phaneritc (can see the crystals)
visible minerals: K-spar (pink) & biotite (black sheets) & quartz (white?)
F/M/I: felsic
cooling rate: slow (so many crystals you can see)

Answer 5

Granite

Question 6

texture: phaneritic (can see crystals)
visible minerals: Na plag(white) & amphibole (black)
F/M/I: intermediate
cooling rate: slow

Answer 6

diorite

Question 7

texture: phaneritic (can see crystals)
visible minerals: pyroxene (black) ca plag (black)
F/M/I: Mafic
cooling rate: slow

Answer 7

gabbro

Question 8

texture: aphanitic
visible minerals: n/a
F/M/I: mafic
cooling rate: fast

Answer 8

basalt

Question 9

texture: vesicular
visible minerals: n/a
F/M/I: felsic
cooling rate: very fast

Answer 9

pumice

Question 10

texture: vesicular
visible minerals: n/a
f/m/I: magic
cooling rate: very fast

Answer 10

scoria