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