Blue silicates used as gems
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IOLITESBlue silicates used as gems.
beryla mineral consisting of a silicate of beryllium and aluminum of great hardness that occurs in colorless hexagonal prisms when pure and in various colors (as green, blue, yellow, or pink) when not pure, that is valued as a source of gems, and that is the principal source of beryllium
zeoliticany of a group of hydrated silicates of aluminum with alkali metals, commonly occurring as secondary minerals in cavities in basic volcanic rocks: used for their molecular sieve properties because they undergo dehydration with little or no change in cryst
zeolitesany of a group of hydrated silicates of aluminum with alkali metals, commonly occurring as secondary minerals in cavities in basic volcanic rocks: used for their molecular sieve properties because they undergo dehydration with little or no change in cryst
zeoliteany of a group of hydrated silicates of aluminum with alkali metals, commonly occurring as secondary minerals in cavities in basic volcanic rocks: used for their molecular sieve properties because they undergo dehydration with little or no change in cryst
SPINELSMinerals used as gems
spinellemineral of this group, essentially magnesium aluminate, MgAl2O4, some varieties being used as gems
spinelmineral of this group, essentially magnesium aluminate, MgAl2O4, some varieties being used as gems
spodumenemineral, lithium aluminum silicate, LiAlSi2O6, occurring in prismatic crystals, transparent varieties being used as gems
semipreciousDenoting minerals that can be used as gems but are considered to be less valuable than precious stones
rougered powder consisting essentially of ferric oxide used in polishing glass, metal, or gems and as a pigment
corundumscommon mineral, aluminum oxide, Al2O3, notable for its hardness: transparent varieties, as sapphire and ruby, are used as gems, other varieties as abrasives: often made synthetically
corundumcommon mineral, aluminum oxide, Al2O3, notable for its hardness: transparent varieties, as sapphire and ruby, are used as gems, other varieties as abrasives: often made synthetically