GIA Final Exam Colored Stones Questions and Answers (Graded A)
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Course
Gia
Institution
Gia
GIA Final Exam Colored Stones Questions and Answers (Graded A)GIA Final Exam Colored Stones Questions and Answers (Graded A)GIA Final Exam Colored Stones Questions and Answers (Graded A)GIA Final Exam Colored Stones Questions and Answers (Graded A)
tree resin hardened over time up to 1000 years - ...
GIA Final Exam Colored Stones
Questions and Answers
(Graded A)
tree resin hardened over time up to 1000 years - ANSWER - amber
inmature amber - ANSWER - copal
most valuable amber - ANSWER - transparent red
cause amber color change over time - ANSWER - oxidation
circular marks sometimes left in amber when heat and oil it - ANSWER - sun
spangles
coral most valuable color - ANSWER - intense red
color of conchiolin coral - ANSWER - black and gold
most valuable ivory - ANSWER - elephant tusks
ornamental form of lignite coal - ANSWER - jet
major jet source - ANSWER - England
Most of the gems in Tanzania's Umba River Valley are found in - ANSWER - placer
deposits
,From granite, pegmatite gems get exotic elements like - ANSWER - beryllium, boron,
and lithium.
Heat and pressure transform limestone into - ANSWER - marble
A natural, inorganic substance with a characteristic chemical composition and
usually characteristic crystal structure is a(n) - ANSWER - mineral
Which of the following is a gem variety - ANSWER - demantoid
A substance that consists of atoms of only one kind is a - ANSWER - Chemicals
element
Myanmar's famous Mogok ruby deposits were formed by - ANSWER - metamorphic
processes.
Which type of twinning looks as if two crystal halves are mirror images - ANSWER -
Contact
Which type of twinning is caused by environmental change after the gem forms -
ANSWER - Polysynthetic
A unit cell defines a mineral's - ANSWER - basic identity.
Which is classified in the orthorhombic crystal system - ANSWER -
topaz,iolite,tanzanite,chrysoberyl and peridot
Crystals that grow in a flux that is highly saturated with the necessary elements
tend to be - ANSWER - small
How heavy an object is in relation to its size is called its - ANSWER - density
, Which element does chromium substitute for to cause ruby's red - ANSWER -
Aluminum
Which element causes the color of both almandine and peridot - ANSWER - iron
Which components of a transition element's atoms can produce color in gems -
ANSWER - electrons
Adularescence is caused by - ANSWER - scattering of light
A broad gem category based on chemical composition and crystal structure is a -
ANSWER - gem species.
Kunzite is most often found in association with - ANSWER - tourmaline and beryl in
pegmatite.
Which phenomenon is a broad color flash - ANSWER - labradorescence
The pattern of dark vertical lines or bands shown by certain gems when viewed
through a spectroscope is called - ANSWER - absorption spectrum
The process where electrons that selectively absorb light are passed back and forth
between neighboring impurity ions is known as - ANSWER - charge transfer.
Which gem can show three pleochroic colors - ANSWER - Like tanzanite and
andalusite, iolite can show three pleochroic colors.
Which process uses a heating unit that passes over a rotating solid rod of chemicals
until it forms a synthetic crystal? - ANSWER - Floating zone
The two main types of processes for synthetic gem production are melt and -
ANSWER - solution
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