Exam (elaborations)
GIA Colored Stones Assignment 2
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GIA Colored Stones Assignment 2
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GIA Colored Stones Assignment 2alluvial deposit - ANS-A deposit where gems are eroded from their source rock, then
transported away from the source and further concentrated.
an understanding of gemstone formation - ANS-What helps prospectors pick the right
places to look for gems?
beryllium, boron, and lithium - ANS-Pegmatite gems are rich in volatile elements like...
contact metamorphism - ANS-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 - ANS-The earth's innermost layer
crust - ANS-The surface and outermost layer of the earth
eluvial deposit - ANS-A deposit where gems are eroded from the source rock but
remain in place close to the source.
erosion - ANS-The wearing away and transport of rock materials by natural forces.
gem formation - ANS-geological conditions during mountain building are favorable for...
gems - ANS-superheated, pressurized water can transfer minerals in solution and
redeposit them in veins to form...
geode - ANS-A spherical, often hollow, mineral-lined cavity in rock.
heavy minerals - ANS-Minerals dense enough to become concentrated and separated
from lighter ones by the action of surface water.
hydrothermal fluid - ANS-Hot, high-pressure solution that can dissolve, transport, and
deposit minerals from one place to another.
igneous rock - ANS-Rock formed by the crystallization of molten material.
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