Igneous Classification Table

Question 1

Silicic minerals silica percentage

Answer 1

> 66%

Question 2

Intermediate minerals silica percentage

Answer 2

52-66%

Question 3

Mafic minerals silica percentage

Answer 3

45-52%

Question 4

Ultramafic minerals percentage

Answer 4

<45%

Question 5

Glassy Silicic

Answer 5

Obsidian

Question 6

Fine silicic

Answer 6

Pumice, rhyolite

Question 7

Medium silicic

Answer 7

Microgranite

Question 8

Coarse silicic

Answer 8

Granite, granodiorite

Question 9

Minerals found in silicic rocks

Answer 9

Quartz, k feldspar, plagioclase (Na), biotite, muscovite

Question 10

Fine intermediate

Answer 10

Andesite

Question 11

Medium intermediate

Answer 11

Microdiorite

Question 12

Coarse intermediate

Answer 12

Diorite, granodiorite

Question 13

Minerals found in intermediate rocks

Answer 13

Quartz (rare), k feldspar, plagioclase (Na), Biotite, Hornblende

Question 14

Glassy mafic

Answer 14

Scoria

Question 15

Medium mafic

Answer 15

Dolerite

Question 16

Coarse mafic

Answer 16

Gabbro

Question 17

Minerals found in mafic rocks

Answer 17

Plagioclase (Ca),Augite, Olivine

Question 18

Coarse ultramafic

Answer 18

Peridotite

Question 19

Minerals found in ultramafic rocks

Answer 19

Augite, olivine

Question 20

Hypabyssal depths

Answer 20

1-10km

Question 21

Plutonic depths

Answer 21

10km+