FINAL EXAM COLORED STONES
QUESTIONS WITH ACTUAL ANSWERS
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
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
,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.
Myanmar's famous Mogok ruby deposits were formed by ANSWER : - metamorphic processes.
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
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
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
A snakeskin structural pattern is typical of ANSWER : - synthetic opal.
Which synthetic process uses an autoclave ANSWER : - Hydrothermal growth
The flux used in the flux process is a solid material that, when molten, ANSWER : - dissolves other
materials.
QUESTIONS WITH ACTUAL ANSWERS
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
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
,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.
Myanmar's famous Mogok ruby deposits were formed by ANSWER : - metamorphic processes.
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
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
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
A snakeskin structural pattern is typical of ANSWER : - synthetic opal.
Which synthetic process uses an autoclave ANSWER : - Hydrothermal growth
The flux used in the flux process is a solid material that, when molten, ANSWER : - dissolves other
materials.
