GIA Colored Stones Assignment
2 with Complete Solutions
rocks - ANSWER - the raw materials of gemstone formation
the continental crust - ANSWER - most colored stones form in...
gem formation - ANSWER - geological conditions during mountain building are
favorable for...
slow cooling - ANSWER - In igneous rocks, large crystals indicate
quick cooling - ANSWER - In igneous rocks, small crystals indicate
volcanic rock - ANSWER - What can transport existing gems from deep in the crust
to the earth's surface?
pegmatites - ANSWER - Some of the largest and most perfect gem crystals come
from...
gems - ANSWER - superheated, pressurized water can transfer minerals in solution
and redeposit them in veins to form...
mining economics - ANSWER - demand, political climate, labor costs, environment,
accessibility, type of deposit, and mining methods all effect...
placer - ANSWER - Workable alluvial deposit of gem minerals with economic
potential.
plate - ANSWER - A section of the earth's rigid outer crust.
, plate tectonics - ANSWER - Study of the formation, structure, and movement of the
plates of the earth's crust.
hydrothermal fluid - ANSWER - Hot, high-pressure solution that can dissolve,
transport, and deposit minerals from one place to another.
igneous rock - ANSWER - Rock formed by the crystallization of molten material.
intrusion - ANSWER - Large mass of igneous rock that crystallizes underground
without reaching the surface.
an understanding of gemstone formation - ANSWER - What helps prospectors pick
the right places to look for gems?
thousands of tons - ANSWER - What amount of rock may be eroded to yield only a
few ounces of gem material?
secondary deposits - ANSWER - Only the toughest gems survive to become part of...
alluvial deposit - ANSWER - A deposit where gems are eroded from their source
rock, then transported away from the source and further concentrated.
contact metamorphism - ANSWER - 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 - ANSWER - The earth's innermost layer
crust - ANSWER - The surface and outermost layer of the earth
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