Minerals
Practice Test
1.
What is an example of an oxide?
a.
sulfur
b.
calcite
c.
magnetite
d.
anhydrite
2.
What is the molten material under Earth's crust called?
a.
basalt
b.
solution
c.
minerals
d.
magma
3.
When magma cools quickly, __________ crystals form, and when it cools slowly, __________ crystals form.
a.
broken, crystals
b.
small, large
c.
large, large
d.
shiny, dull
4.
A mineral is __________ if it can be mined for profit.
a.
a crystal
b.
an ore
c.
a rock
d.
an igneous rock
5.
Which of the minerals listed in the table has the greatest density?
Mineral
Specific Gravity
Chemical Formula
Breakage Pattern
Gold
19.3
Au
Hackly
Apatite
5
Ca
5
(PO
4
)
3
(F,OH,CL)
Uneven fracture
Pyrite
5.2
FeS
2
Uneven fracture
Garnet
3.5- 4.3
(Mg,Fe,Ca)
3
(Al
2
Si
3
O
12
)
Conchodial fracture
Beryl
2.75
Be
3
Al
2
Si
6
O
8
Uneven fracture
Corundumm
4
Al
2
O
3
Fracture
a.
corundum
b.
beryl
c.
pyrite
d.
garnet
6.
__________ is the way a mineral reflects light.
a.
Streak
b.
Color
c.
Luster
d.
Cleavage
7.
What are the common minerals called?
a.
abundant minerals
b.
crystal minerals
c.
igneous minerals
d.
rock-forming minerals
8.
What is the numerical value for the hardest mineral on the Mohs hardness scale?
a.
100
b.
20
c.
11
d.
10
9.
According to the table, what is a characteristic of metallic minerals?
Table 2
Minerals with Metallic Luster
Mineral
(Formula)
Color
Streak
Hardness
Specific Gravity
Crystal System
Breakage pattern
Uses and Other Properties
Bornite
(Cu
5
FeS
2)
bronze, tarnishes to dark blue purple
gray-black
3
4.9-5.4
tetragonal
uneven fracture
source of copper
called "peacock ore" Because of the purple shine when it tarnishes
Chalcopyrite
(CuFeS
2
)
brassy to golden yellow
greenish black
3.5-4
4.2
tetragonal
uneven fracture
main ore of copper
Chromite
(FeCr
2
O
4
)
black or Brown
brown to Black
5.5
4.6
cubic
irregular fracture
ore of chromium, stainless steel, metallurgical bricks
Copper
(Cu)
copper red
copper red
3
8.5 -9
cubic
hackly
coins, pipes, gutters, wire, cooking utensils, jewelry, decorative plaques; malleable and ductile
Galena (PbS)
gray
gray to black
2.5
7.5
cubic
cubic cleavage perfect
source of lead, used in pipes, shields for X-rays, fishing equipment sinkers
Gold
(Au)
pale to golden yellow
yellow
2.5-3
19.3
cubic
hackly
jewelry, money, gold leaf, filling for teeth, medicines, does not tarnish
Graphite
(C)
black to gray
black to gray
1-2
2.3
hexagonal
basal cleavage (scales)
pencil lead, lubricants for locks, rods to control some small nuclear reactions, battery poles
Hematite
(Specular)
(fe
2
O
3
)
Black or reddish brown
red or reddish brown
6
5.3
hexagonal
irregular fracture
source of iron; roasted ina blast furnace, converted into pig iron, made into steel
Magnetite
(fe
3
O
4
)
black
black
6
5.2
cubic
conchodial fracture
source of iron, naturally magnetic, called lodestone
Pyrite
(FeS
2
)
light, brassy yellow
greenish black
6.5
5.0
cubic
uneven fracture
source of iron, [CDATA["]]fool's gold,[CDATA["]] alters to limonite
Pyrrhotite
(Fe
1-x
S
)*
*contains one less atom of Fe than S
bronze
gray-black
4
4.6
hexagonal
uneven fracture
an ore of iron and sulfur; may be magnetic
Silver(Ag)
silvery white, tarnishes to black
light gray to silver
2.5
10-12
cubic
hackly
coins, filling for teeth, jewelry, silver plate, wires; malleable and ductile
a.
gray, green, brown, or red streak
b.
colorless streak
c.
no crystalline structure
d.
low hardness value
10.
__________ is the measure of how easily a mineral can be scratched.
a.
Hardness
b.
Specific gravity
c.
Luster
d.
Streak
