Exam (elaborations)
GIA COLORED STONES ASSIGNMENT 2 QUESTIONS AND ANSWERS
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GIA COLORED STONES ASSIGNMENT 2 QUESTIONS AND ANSWERS
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Name: Score:53 Multiple choice questions
Definition 1 of 53
In igneous rocks, large crystals indicate
rapid cooling
fast cooling
slow cooling
quick cooling
Definition 2 of 53
geological conditions during mountain building are favorable for...
intrusion
gem formation
subduction
erosion
Definition 3 of 53
A deposit where gems are eroded from the source rock but remain in place close to the
source.
primary deposit
alluvial deposit
eluvial deposit
heavy minerals
,Definition 4 of 53
Pertaining to igneous activity at the earth's surface, where magma erupts through a volcano or
a fissure.
rocks
magma
igneous rock
volcanic
Definition 5 of 53
What helps prospectors pick the right places to look for gems?
an understanding of gemstone formation
subduction
mantle convection
intrusion
Definition 6 of 53
Kunzite is most often found in association with...
sapphire in lava
placer deposits
moonstone in basalt
tourmaline and beryl in pegmatite
Definition 7 of 53
Which is a key locality for hydrothermal gems?
Beryllium, Boron, And Lithium
Tanzania
Mogok, Myanmar
Ouro Preto, Brazil
,Definition 8 of 53
A layer between the earth's crust and its core.
crust
magma
mantle
core
Definition 9 of 53
Pegmatite gems are rich in volatile elements like...
chromium and vanadium
iron, magnesium, and titanium
beryllium, boron, and lithium
tourmaline and beryl in pegmatite
Definition 10 of 53
Hot, high-pressure solution that can dissolve, transport, and deposit minerals from one place
to another.
supercritical fluid
hydrothermal fluid
rock cycle
magmatic water
Definition 11 of 53
A constant formation and recycling process that creates new rock from old.
igneous rock
metamorphic rock
rock cycle
plate tectonics
, Definition 12 of 53
In igneous rocks, small crystals indicate
geode
high altitude
quick cooling
slow cooling
Definition 13 of 53
Most of the gems in Tanzania's Umba River Valley are found in...
hydrothermal deposits
pegmatites
placer deposits
alluvial deposits
Definition 14 of 53
Localized changes caused by an igneous intrusion that takes place where the magma meets
the surrounding rock. New minerals may form due to temperature changes or introduction of
fluids from the magma.
contact metamorphism
secondary
rock cycle
marble
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