Quiz #3 Igneous Rocks

Question 1

Which of the following igneous rocks has an extrusive texture?
Granite, Diorite, Pegmatite, Basalt, Dunite

Answer 1

Diorite

Question 2

Which of the following Igneous textures is associated with the term Phenocryts?
Phaneritic, Aphanitic, Porphyritic, Glassy, Pyroclastic

Answer 2

Porphyritic

Question 3

Dark (calcium) plagioclase and pyroxene are essential minerals of which of the following?
Pumice, Tuff, Dunite, Andesite, None of the above

Answer 3

None of the above. It is a Feldspar

Question 4

Which of the following is a concordant Igneous body?
Lava flows, Batholith, Stock, Sill, Dike

Answer 4

Sill

Question 5

Which of the following does not have a phanertic texture?
Peridotite, Granite, Andesite, Gabbro, Dunite

Answer 5

Andesite

Question 6

Which of the following is not a volcanic rock?
Obsidian, Scoria, Pumice, Rhyolite, Granite

Answer 6

Granite

Question 7

Which Igneous rock is described by the following?: “Vesicular texture comprised of minerals resulting in a dark or black rock color”
Pumice, Obsidian, Basalt, Scoria, None of the above

Answer 7

Scoria

Question 8

The name of the discontinuous mineral which forms first from a cooling magma.
Quartz, Calcic Plagioclase, Sodic Plagioclase, Olivine, Pyroxene

Answer 8

Olivine

Question 9

Which of the following is not an igneous rock?
Pumice, Obsidian, Diorite, Marble, Andesite

Answer 9

Marble