GIA Colored Stones Assignment
3 Questions and Answers 100%
Verified
crystalline minerals - ANSWER - what are classified into seven crystal systems,
depending on the symmetry of their unit cells?
exterior shape - ANSWER - what part of a crystal often indicates its symmetry at an
atomic level?
rare - ANSWER - What do you call gems that require rare chemical elements or
unique geological conditions, or both, to form?
twinning - ANSWER - What can result form a change during crystal growth, or from
cooling or pressure after the crystal has grown?
inclusion - ANSWER - A characteristic enclosed within a gemstone, or reaching its
surface from the interior.
liquid inclusion - ANSWER - Small pocket in a gem that's filled with fluids and,
sometimes, gas bubbles and tiny crystals. Usually created by environmental
changes during crystal growth.
inclusions - ANSWER - What can help identify a colored stone as natural or
manmade, untreated or treated?
large inclusions - ANSWER - What can dramatically affect beauty, value, and
durability?
identify them - ANSWER - What can a gemstone's recognizable crystal shape help
do?
, reaction to external stress - ANSWER - A gem's crystal structure determines its...
aggregate - ANSWER - A mass of tiny, randomly oriented crystals.
cleavage - ANSWER - A smooth, flat break in a gemstone parallel to planes of atomic
weakness, caused by weak or fewer bonds between atoms, or both.
conchoidal fracture - ANSWER - A curved and ridged fracture in a gemstone,
extending from the surface inward.
cryptocrystalline - ANSWER - An aggregate made up of individual crystals
detectable only under very high magnification.
density - ANSWER - How heavy an object is in relation to its size.
durability - ANSWER - A gemstone's ability to withstand wear, heat, and chemicals.
fracture - ANSWER - Any break in a gem other than cleavage or parting.
habit - ANSWER - The characteristic external crystal shape or form of a mineral.
hardness - ANSWER - How well a gemstone resists scratches. Usually expressed in
terms of the Mohs scale, with diamond the hardest (10) and talc the softest (1).
microcrystalline - ANSWER - An aggregate made up of individual crystals visible
under magnification.
parting - ANSWER - A flat break in a gemstone caused by concentrated included
minerals parallel to a twinning plane.
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