tree resin hardened over time up to 1000 years️️amber
inmature amber️️copal
most valuable amber️️transparent red
cause amber color change over time️️oxidation
circular marks sometimes left in amber when heat and oil it️️sun spangles
coral most valuable color️️intense re...
Final exam colored stones with comprehensive questions and
answers 2024/2025
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
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