GIA Colored Stone Final Exam questions
and answers
By what date had Kokichi Mikimoto begun culturing whole pearls -
ANSWER>>1908
Synthetic gem materials - ANSWER>>Are not minerals
which of the following is an organic gem - ANSWER>>amber
which of the following is amorphous - ANSWER>>amber
a natural material that's made up of a mass of one or more kinds of
mineral crystals is - ANSWER>>rock
what group does alamandine belong to - ANSWER>>garnet
A gem produced by, or derived from, a living organism is -
ANSWER>>organic
which of the following is a gem variety - ANSWER>>demantoid
the world's largest gem-consuming market is - ANSWER>>the US
a substance that consists of atoms of only one kind is a -
ANSWER>>chemical element
,Media attention in the 1990s regarding its treatment reduced
consumer confidence in - ANSWER>>emerald
a natural, inorganic substance with a characteristic chemical
composition and usual crystal structure is a - ANSWER>>mineral
most gems are - ANSWER>>minerals
To be a gem, a mineral must be beautiful, durable, and -
ANSWER>>rare
a broad gem category based on chemical composition and crystal
structure is called a - ANSWER>>gem species
Many colored stones are mined by - ANSWER>>independent miners
using small-scale mining methods.
Rocks altered by heat and pressure beneath Earth's surface are -
ANSWER>>metamorphic
Which type of deposit is usually the most profitable for colored stone
mining? - ANSWER>>secondary
Which gem can crystallize in volcanic rock from gasses released by
magma? - ANSWER>>red beryl
Emeralds are rarely found in placer deposits because they're -
ANSWER>>unable to withstand much abrasion
,Which is a workable alluvial deposit of gem minerals with economic
potential? - ANSWER>>placers
Which is a deposit where gems eroded from the source rock and
remained in place nearby? - ANSWER>>eluvial
from granite, pegmatite gems get exotic elements like -
ANSWER>>beryllium, boron, and lithium
Myanmar's famous Mogok ruby deposits were formed by -
ANSWER>>metamorphic process
most of the gems in tanzania's umba river valley are formed in -
ANSWER>>placer deposits
A deposit where gems are found in the rock that where they formed is
called - ANSWER>>primary deposit
Which is a key locality for hydrothermal gems? - ANSWER>>Ouro Preto,
Brazil
Heat and pressure transform limestone into - ANSWER>>marble
which gem form by metamophosis - ANSWER>>tanzanite
Most gemstones form in the - ANSWER>>continental crust
, kunzite is most often associated with - ANSWER>>tourmaline and beryl
in pegmatites
how heavy an object is in relation to its size - ANSWER>>density
A two-phase inclusion is a cavity in a gem that's typically filled with a -
ANSWER>>liquid and a gas
which type of twinning is caused by environmental change after a gem
forms - ANSWER>>polysynthetic
which element caused red in ruby and green in emerald -
ANSWER>>chromium
A unit cell defines a mineral's - ANSWER>>basic identity
which type of twinning looks as if two crystal halves are mirror images -
ANSWER>>contact twinning
crystals that grow in a flux that is highly saturated with the necessary
elements tend to be - - ANSWER>>small
which is classified in the orthorhombic crystal system - ANSWER>>topaz
Which gems are cryptocrystalline aggregates? - ANSWER>>Chalcedony
and turquoise
and answers
By what date had Kokichi Mikimoto begun culturing whole pearls -
ANSWER>>1908
Synthetic gem materials - ANSWER>>Are not minerals
which of the following is an organic gem - ANSWER>>amber
which of the following is amorphous - ANSWER>>amber
a natural material that's made up of a mass of one or more kinds of
mineral crystals is - ANSWER>>rock
what group does alamandine belong to - ANSWER>>garnet
A gem produced by, or derived from, a living organism is -
ANSWER>>organic
which of the following is a gem variety - ANSWER>>demantoid
the world's largest gem-consuming market is - ANSWER>>the US
a substance that consists of atoms of only one kind is a -
ANSWER>>chemical element
,Media attention in the 1990s regarding its treatment reduced
consumer confidence in - ANSWER>>emerald
a natural, inorganic substance with a characteristic chemical
composition and usual crystal structure is a - ANSWER>>mineral
most gems are - ANSWER>>minerals
To be a gem, a mineral must be beautiful, durable, and -
ANSWER>>rare
a broad gem category based on chemical composition and crystal
structure is called a - ANSWER>>gem species
Many colored stones are mined by - ANSWER>>independent miners
using small-scale mining methods.
Rocks altered by heat and pressure beneath Earth's surface are -
ANSWER>>metamorphic
Which type of deposit is usually the most profitable for colored stone
mining? - ANSWER>>secondary
Which gem can crystallize in volcanic rock from gasses released by
magma? - ANSWER>>red beryl
Emeralds are rarely found in placer deposits because they're -
ANSWER>>unable to withstand much abrasion
,Which is a workable alluvial deposit of gem minerals with economic
potential? - ANSWER>>placers
Which is a deposit where gems eroded from the source rock and
remained in place nearby? - ANSWER>>eluvial
from granite, pegmatite gems get exotic elements like -
ANSWER>>beryllium, boron, and lithium
Myanmar's famous Mogok ruby deposits were formed by -
ANSWER>>metamorphic process
most of the gems in tanzania's umba river valley are formed in -
ANSWER>>placer deposits
A deposit where gems are found in the rock that where they formed is
called - ANSWER>>primary deposit
Which is a key locality for hydrothermal gems? - ANSWER>>Ouro Preto,
Brazil
Heat and pressure transform limestone into - ANSWER>>marble
which gem form by metamophosis - ANSWER>>tanzanite
Most gemstones form in the - ANSWER>>continental crust
, kunzite is most often associated with - ANSWER>>tourmaline and beryl
in pegmatites
how heavy an object is in relation to its size - ANSWER>>density
A two-phase inclusion is a cavity in a gem that's typically filled with a -
ANSWER>>liquid and a gas
which type of twinning is caused by environmental change after a gem
forms - ANSWER>>polysynthetic
which element caused red in ruby and green in emerald -
ANSWER>>chromium
A unit cell defines a mineral's - ANSWER>>basic identity
which type of twinning looks as if two crystal halves are mirror images -
ANSWER>>contact twinning
crystals that grow in a flux that is highly saturated with the necessary
elements tend to be - - ANSWER>>small
which is classified in the orthorhombic crystal system - ANSWER>>topaz
Which gems are cryptocrystalline aggregates? - ANSWER>>Chalcedony
and turquoise
