Unit one quiz

Question 1

Name one mineral that has perfect cleavage in one direction?

Answer 1

Micas

Question 2

What is the colour of hematite’s (Fe2O3) streak?3

Answer 2

reddish brown

Question 3

What is the only crystal system with four axes?

Answer 3

Hexagonal

Question 4

What is the term used to describe an igneous rock with large, well-formed crystals in a very fine-grained matrix (groundmass)

Answer 4

Porphyritic

Question 5

If a sedimentary rock is composed of fragments/clasts of pre-existing rocks, what type of sedimentary rock is it?

Answer 5

Clastic

Question 6

if a rock is similar to a breccia, but contains rounded clasts instead of angular clasts, what is the name of this rock?

Answer 6

Conglomerate

Question 7

Coquina represents a biogenic sedimentary rock formed from accumulation of what type of material?

Answer 7

sand size fossil debris

Question 8

What is the hardest mineral on the Moh’s scale of hardness, with a hardness of 10?

Answer 8

Diamond

Question 9

What is the hardness of the mineral corundum?

Answer 9

9

Question 10

What is the softest mineral on the Moh’s scale of hardness, with a hardness of 1?

Answer 10

Talc

Question 11

What is the most common chemical group of minerals?

Answer 11

Silicates

Question 12

List the most highly-abundant elements in the Earth’s crust?

Answer 12

Oxygen

Question 13

Which rock type forms through the crystallization of magma?

Answer 13

Igneous rock

Question 14

Which rock type forms through the application of heat and/or pressure to pre-existing rocks?

Answer 14

Metamorphic rocks

Question 15

What characteristic texture of metamorphic rocks is formed by the alignment of platy mineral grains, such as micas

Answer 15

Planar foliation

Question 16

Which type of metamorphism is large-scale and often occurs during the formation of mountain belts

Answer 16

regional metamorphism

Question 17

Define the term “cleavage”. Can it be used to describe the crystal faces of a mineral?

Answer 17

the tendency of a mineral to break along certain planes to make smooth surfaces

Question 18

Can minerals can have different hardnesses on different crystal faces?

Answer 18

minerals hardness varies from crystal face to crystal face

Question 19

What is more reliable in mineral identification, the colour of a mineral or the colour of its streak?

Answer 19

streak

Question 20

What is the luster of the mineral quartz?

Answer 20

scale 7, streak white

Question 21

What is the luster of the mineral galena?

Answer 21

Metallic

Question 22

If a mineral has three axes of symmetry of equal length, all 90° to one another, in which crystal system does it belong?

Answer 22

Isometric