Igneous Rocks Lab

Question 1

Igneous rock textures

Answer 1

Phaneritic, aphanitic, glassy, porphyritic, vesicular, pyroclastic

Question 2

Difference between intrusive and extrusive

Answer 2

Intrusive means that the rock cooled under the surface. Intrusive rocks have larger crystals. Extrusive means that the rock cooled outside the surface. Extrusive rocks have small crystals or no crystals at all.

Question 3

What minerals can be found in a mafic rock?(4)

Answer 3

Olivine, pyroxene, plagioclase, and sometimes amphibole

Question 4

What minerals can be found in an intermediate rock?(6)

Answer 4

Plagioclase, hornblende, quartz, biotite, k-feldspar, and sometimes pyroxene

Question 5

What minerals can be found in a felsic rock?(5)

Answer 5

plagioclase, k-feldspar, quartz, amphibole, and biotite

Question 6

Two types of felsic (silicic) rock

Answer 6

Rhyolite (extrusive) and Granite (intrusive)

Question 7

Two types of intermediate rock

Answer 7

Andesite (extrusive) and Diorite (intrusive)

Question 8

Two types of mafic rock

Answer 8

Basalt (extrusive) and Gabbro (intrusive)