Gia Colored Stones Assignment 24 Garnet And Spinel Exam With Complete Solutions

Gia Colored Stones Assignment 24 b b b b




Garnet And Spinel Exam With Complete
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Solutions b




Africa - ANSWER-Most garnets come from sources in A_________.
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tsavorite - ANSWER-Green garnets are called...
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spinel - ANSWER-Many famous "rubies," cherished by kings and emperors, were actually red __________.
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synthetic - ANSWER-The most common type of spinel known by consumers is ______________.
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singly - ANSWER-Garnet and spinel are both __________ refractive. Cutters don't have to consider
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pleochroism when they orient rough for fashioning.
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bohemian - ANSWER-1500 saw the discovery of the B____________ garnet deposits in central Europe.
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(Garnet reached its peak in the late 1800's, since then they've seen a decline)
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,red garnet - ANSWER-______ __________ is one of the most common and widespread of gems, found in
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metamorphic rocks on every continent.
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pegmatite - ANSWER-Spessartine garnet, an uncommon orange, is most often found in ____________
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veins, which occur only occasionally.
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metamorphic - ANSWER-Tsavorite garnet occurs in __________________ rocks, but is rare because it
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requires unusual rock chemistries and special conditions to form.
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group - ANSWER-Granets are a set of closely related mineral species that form a __________.
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group - ANSWER-The members of a ___________ can vary in crystal structure or chemical composition, but
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hey always have common characteristics in at least one of those categories.
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garnets, cubic, dodecahedron - ANSWER-___________ all belong to the __________ crystal system, and
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their most common habit is _________________. (They do vary slightly in their chemical compositions,
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though.)
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cubic - ANSWER-Like diamond and spinel, garnet crystallizes in the ___________ crystal system.
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20 - ANSWER-There are more than _______ garnet species, but only five are commercially important as
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gems. (pyrope, almandine, spessartine, grossular, and andradite, +.5 uvarovite) PAAGSU
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varieties - ANSWER-Gemologists and colored stone dealers further subdivide some garnet species into
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_____________ depending on their color.
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garnets - ANSWER-Many ____________ are mixtures of two or more species. Different combinations of
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pyrope, almandine, and spessartine combine to produce garnets that range in color from orangy red
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through red and purplish-red to purple. Rhodolite, for example, is a mixture of pyrope and almandine.
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, Mali - ANSWER-These garnets are grossular and andradite... AG
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uvarovite - ANSWER-A rare chromium garnet that's found only as tiny crystals, too small for faceting. U
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intergrown - ANSWER-Garnet often grows as masses of ___________________ crystals.
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demantoid - ANSWER-Green andradite garnet variety are called _____________
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substitute - ANSWER-Garnet species mixtures are possible because chemical elements can
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______________ for one another in a mineral's crystal structure. (Pyrope and almandine have identical
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crystals structures, their chemistry is what's different.)
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related - ANSWER-In general, isomorphous replacement occurs much more with ___________ garnets
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than it does between the sets.
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color - ANSWER-Many dealers sell and classify garnets based on ____________.
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rhodolite - ANSWER-Pyrope-almandine garnet is known as ______________ in the trade.
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malaya - ANSWER-A trade term for a pinkish orange mixture of pyrope, almandine, and spessartine. M (not
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widely used)
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aluminum, calcium - ANSWER-There are two garnet groups: A____________ and C____________.
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tsavorite, demantoid - ANSWER-Two green garnets are... (highest-price gems in the garnet group)
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