Essential and type minerals of common igneous rocks

Question 1

What are the two essential minerals of basalt/gabbro?

Answer 1

Augite, calcitic plagioclase

Question 2

What are the three possible type minerals of basalt/gabbro?

Answer 2

Olivine, low calcium pyroxene, nephaline

Question 3

What are the two (five) essential minerals of andesite/diorite?

Answer 3

Sodic plag, pyroxene/hornblende/biotite

Question 4

What are the three essential minerals of dacite/granodiorite?

Answer 4

Sonic plag, alkali feldspar, quartz

Question 5

What are the two possible type minerals of dacite/granodiorite?

Answer 5

Hornblende, biotite

Question 6

What are the three essential minerals in rhyolite/granite?

Answer 6

Alkali feldspar, sodic plag, quartz

Question 7

What are the two possible type minerals in rhyolite/granite?

Answer 7

Biotite, aegirine