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GIA Colored Stones Assignment 24 Garnet and Spinel exam (164 questions and answers).
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GIA Colored Stones Assignment 24 Garnet and Spinel exam (164 questions and answers).
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GIA Colored StonesAssignment 24: Garnet
and Spinel exam (164
questions and
answers)
Africa - answer Most garnets come from sources
in A_________.
tsavorite - answer Green garnets are called...
spinel - answer Many famous "rubies," cherished
by kings and emperors, were actually red __________.
synthetic - answer The most common type of
spinel known by consumers is ______________.
singly - answer Garnet and spinel are both
__________ refractive. Cutters don't have to consider
pleochroism when they orient rough for fashioning.
,bohemian - answer 1500 saw the discovery of the
B____________ garnet deposits in central Europe.
(Garnet reached its peak in the late 1800's, since
then they've seen a decline)
red garnet - answer ______ __________ is one of the
most common and widespread of gems, found in
metamorphic rocks on every continent.
pegmatite - answer Spessartine garnet, an
uncommon orange, is most often found in
____________ veins, which occur only occasionally.
metamorphic - answer Tsavorite garnet occurs in
__________________ rocks, but is rare because it
requires unusual rock chemistries and special
conditions to form.
group - answer Granets are a set of closely
related mineral species that form a __________.
group - answer The members of a ___________ can
vary in crystal structure or chemical composition,
but hey always have common characteristics in at
least one of those categories.
, garnets, cubic, dodecahedron - answer ___________
all belong to the __________ crystal system, and their
most common habit is _________________. (They do
vary slightly in their chemical compositions,
though.)
cubic - answer Like diamond and spinel, garnet
crystallizes in the ___________ crystal system.
20 - answer There are more than _______ garnet
species, but only five are commercially important
as gems. (pyrope, almandine, spessartine,
grossular, and andradite, +.5 uvarovite) PAAGSU
varieties - answer Gemologists and colored stone
dealers further subdivide some garnet species into
_____________ depending on their color.
garnets - answer Many ____________ are mixtures of
two or more species. Different combinations of
pyrope, almandine, and spessartine combine to
produce garnets that range in color from orangy
red through red and purplish-red to purple.
Rhodolite, for example, is a mixture of pyrope and
almandine.
Mali - answer These garnets are grossular and
andradite... AG
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