Final exam colored stones spring 2023 with complete solution
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Course
Colored stones
Institution
Colored Stones
Final exam colored stones spring 2023 with complete solution
tree resin hardened over time up to 1000 years
amber
inmature amber
copal
most valuable amber
transparent red
cause amber color change over time
oxidation
circular marks sometimes left in amber when heat and oil it
sun spangle...
final exam colored stones spring 2023 with complete solution tree resin hardened over time up to 1000 years amber inmature amber copal most valuable amber transparent red cause amber color change ove
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Final exam colored stones spring 2023 with complete
solution
tree resin hardened over time up to 1000 years
amber
inmature amber
copal
most valuable amber
transparent red
cause amber color change over time
oxidation
circular marks sometimes left in amber when heat and oil it
sun spangles
coral most valuable color
intense red
color of conchiolin coral
black and gold
most valuable ivory
elephant tusks
ornamental form of lignite coal
jet
major jet source
England
A natural, inorganic substance with a characteristic chemical composition and
usually characteristic crystal structure is a(n)
mineral
Which of the following is a gem variety
demantoid
A substance that consists of atoms of only one kind is a
Chemicals element
A broad gem category based on chemical composition and crystal structure is a
gem species.
Kunzite is most often found in association with
tourmaline and beryl in pegmatite.
Myanmar's famous Mogok ruby deposits were formed by
metamorphic processes.
Most of the gems in Tanzania's Umba River Valley are found in
placer deposits
From granite, pegmatite gems get exotic elements like
beryllium, boron, and lithium.
Heat and pressure transform limestone into
marble
Which type of twinning looks as if two crystal halves are mirror images
Contact
Which type of twinning is caused by environmental change after the gem forms
, Polysynthetic
A unit cell defines a mineral's
basic identity.
Which is classified in the orthorhombic crystal system
topaz,iolite,tanzanite,chrysoberyl and peridot
Crystals that grow in a flux that is highly saturated with the necessary elements
tend to be
small
How heavy an object is in relation to its size is called its
density
Which element does chromium substitute for to cause ruby's red
Aluminum
Which element causes the color of both almandine and peridot
iron
Which components of a transition element's atoms can produce color in gems
electrons
Adularescence is caused by
scattering of light
Which phenomenon is a broad color flash
labradorescence
The pattern of dark vertical lines or bands shown by certain gems when viewed
through a spectroscope is called
absorption spectrum
The process where electrons that selectively absorb light are passed back and
forth between neighboring impurity ions is known as
charge transfer.
Which gem can show three pleochroic colors
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?
Floating zone
The two main types of processes for synthetic gem production are melt and
solution
A snakeskin structural pattern is typical of
synthetic opal.
Which synthetic process uses an autoclave
Hydrothermal growth
The flux used in the flux process is a solid material that, when molten,
dissolves other materials.
Which process dissolves nutrients in chemicals to form synthetic crystals?
Flux growth
Which synthetic process developed rapidly due to laser research in the 1960
pulling
Synthetic opal is grown using microscopic silica spheres that are produced by
precipitation
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