GIA COLORED STONES ASSIGNMENT 2 QUESTIONS AND
CORRECT SOLUTIONS 100%
rocks the raw materials of gemstone formation
the continental crust most colored stones form in...
gem formation geological conditions during mountain building are favorable for...
slow cooling In igneous rocks, large crystals indicate
quick cooling In igneous rocks, small crystals indicate
volcanic rock What can transport existing gems from deep in the crust to the earth's surface?
pegmatites Some of the largest and most perfect gem crystals come from...
gems superheated, pressurized water can transfer minerals in solution and redeposit them in
veins to form...
mining economics demand, political climate, labor costs, environment, accessibility, type of
deposit, and mining methods all effect...
an understanding of gemstone formation What helps prospectors pick the right places to look for
gems?
thousands of tons What amount of rock may be eroded to yield only a few ounces of gem
material?
secondary deposits What are easier to work than primary deposits?
primary deposits What contains less concentrations of gems than secondary deposits?
, GIA COLORED STONES ASSIGNMENT 2 QUESTIONS AND
CORRECT SOLUTIONS 100%
secondary deposits Only the toughest gems survive to become part of...
alluvial deposit A deposit where gems are eroded from their source rock, then transported away
from the source and further concentrated.
contact metamorphism 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.
core The earth's innermost layer
crust The surface and outermost layer of the earth
eluvial deposit A deposit where gems are eroded from the source rock but remain in place close
to the source.
erosion The wearing away and transport of rock materials by natural forces.
geode A spherical, often hollow, mineral-lined cavity in rock.
heavy minerals Minerals dense enough to become concentrated and separated from lighter ones
by the action of surface water.
hydrothermal fluid Hot, high-pressure solution that can dissolve, transport, and deposit minerals
from one place to another.
igneous rock Rock formed by the crystallization of molten material.
intrusion Large mass of igneous rock that crystallizes underground without reaching the surface.
CORRECT SOLUTIONS 100%
rocks the raw materials of gemstone formation
the continental crust most colored stones form in...
gem formation geological conditions during mountain building are favorable for...
slow cooling In igneous rocks, large crystals indicate
quick cooling In igneous rocks, small crystals indicate
volcanic rock What can transport existing gems from deep in the crust to the earth's surface?
pegmatites Some of the largest and most perfect gem crystals come from...
gems superheated, pressurized water can transfer minerals in solution and redeposit them in
veins to form...
mining economics demand, political climate, labor costs, environment, accessibility, type of
deposit, and mining methods all effect...
an understanding of gemstone formation What helps prospectors pick the right places to look for
gems?
thousands of tons What amount of rock may be eroded to yield only a few ounces of gem
material?
secondary deposits What are easier to work than primary deposits?
primary deposits What contains less concentrations of gems than secondary deposits?
, GIA COLORED STONES ASSIGNMENT 2 QUESTIONS AND
CORRECT SOLUTIONS 100%
secondary deposits Only the toughest gems survive to become part of...
alluvial deposit A deposit where gems are eroded from their source rock, then transported away
from the source and further concentrated.
contact metamorphism 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.
core The earth's innermost layer
crust The surface and outermost layer of the earth
eluvial deposit A deposit where gems are eroded from the source rock but remain in place close
to the source.
erosion The wearing away and transport of rock materials by natural forces.
geode A spherical, often hollow, mineral-lined cavity in rock.
heavy minerals Minerals dense enough to become concentrated and separated from lighter ones
by the action of surface water.
hydrothermal fluid Hot, high-pressure solution that can dissolve, transport, and deposit minerals
from one place to another.
igneous rock Rock formed by the crystallization of molten material.
intrusion Large mass of igneous rock that crystallizes underground without reaching the surface.
