Gia Colored Stones Assignment 24
Garnet And Spinel Exam With
Complete Solutions
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
uvarovite - ANSWER-A rare chromium garnet that's found only as tiny crystals, too small for faceting. U
intergrown - ANSWER-Garnet often grows as masses of ___________________ crystals.
demantoid - ANSWER-Green andradite garnet variety are called _____________
substitute - ANSWER-Garnet species mixtures are possible because chemical elements can
______________ for one another in a mineral's crystal structure. (Pyrope and almandine have identical
crystals structures, their chemistry is what's different.)
related - ANSWER-In general, isomorphous replacement occurs much more with ___________ garnets
than it does between the sets.
color - ANSWER-Many dealers sell and classify garnets based on ____________.
rhodolite - ANSWER-Pyrope-almandine garnet is known as ______________ in the trade.
malaya - ANSWER-A trade term for a pinkish orange mixture of pyrope, almandine, and spessartine. M
(not widely used)
Garnet And Spinel Exam With
Complete Solutions
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
uvarovite - ANSWER-A rare chromium garnet that's found only as tiny crystals, too small for faceting. U
intergrown - ANSWER-Garnet often grows as masses of ___________________ crystals.
demantoid - ANSWER-Green andradite garnet variety are called _____________
substitute - ANSWER-Garnet species mixtures are possible because chemical elements can
______________ for one another in a mineral's crystal structure. (Pyrope and almandine have identical
crystals structures, their chemistry is what's different.)
related - ANSWER-In general, isomorphous replacement occurs much more with ___________ garnets
than it does between the sets.
color - ANSWER-Many dealers sell and classify garnets based on ____________.
rhodolite - ANSWER-Pyrope-almandine garnet is known as ______________ in the trade.
malaya - ANSWER-A trade term for a pinkish orange mixture of pyrope, almandine, and spessartine. M
(not widely used)
