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25 Cards in this Set

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amorphous
no regular crystal structure
chemical composition
kinds & relative quantities atoms in material
chemical formula
material's written chemical make-up
colored stone
gem material besides diamond
crystal structure
regular repeating arrangement of atoms
durability
withstand wear, heat, chemicals
gemology
study gems
gem species
category based on chemical composition & structure
gem variety
subcategory of species, based on COLOR, transparency, phenomena
group
family of gems from closely related species
hardness
resist scratches
inorganic
from non-living matter
luster
appearance of surface in reflected light
mineral
natural inorganic substance w/characteristic chemical composition & structure
natural gems
produced by nature w/o human help
organic
once living or produced by living organism
phenomenon
unusual optical effect
stability
resists light, heat, chemicals
synthetic gems
manmade w/ same properties as natural
toughness
resists breaking & chipping
trace elements
atoms not part of gem's essential chemical composition
transparency
degree material allows light to pass through
adularescence
cloudy bluish white light in moonstone due to scattering of light
asterism
crossing of chatoyant bands making star in dome of cabochon
aventurescence
glitter effect due to small flat inclusions w/in stone reflecting light