#crystal a solid formed by the solidification of a chemical and having a highly regular atomic structure
supertype: #solid a substance that is solid at room temperature and pressure
subtype: #snowflake__flake a crystal of snow
subtype: #ice_crystal__snow_mist__diamond_dust__diamonddust__ice_needle__iceneedle__frostsnow__frost_mist__frostmist small crystals of ice
subtype: #gemstone__gem__stone a crystalline rock that can be cut and polished for jewelry
subtype: #cabochon a highly polished convex-cut but unfaceted gem
subtype: #opaque_gem a gemstone that is opaque
subtype: #chrysoberyl a rare hard yellow green mineral consisting of beryllium aluminate in crystal form; used as a gemstone
subtype: #alexandrite a green variety of chrysoberyl used as a gemstone
subtype: #opal a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones
subtype: #black_opal__blackopal a dark colored opal with internal reflections of green or red
subtype: #fire_opal__girasol an opal with flaming orange and yellow and red colors
subtype: #harlequin_opal__harlequinopal a reddish opal with small patches of brilliant color
subtype: #cat's_eye__cat'seye any of various gems (as chrysoberyl or chalcedony) that reflect light when cut in a rounded shape
subtype: #precious_coral__coral__red_coral__redcoral the hard stony skeleton of a Mediterranean coral that has a delicate red or pink color and is used for jewelry
subtype: #jadestone__jade a semiprecious gemstone that takes a high polish; is usually green but sometimes whitish; consists of jadeite or nephrite
subtype: pm#jadite
subtype: #jasper an opaque form of quartz; red or yellow or brown or dark green in color; used for ornamentation or as a gemstone
subtype: #lapis_lazuli__lapislazuli__lazuli an azure blue semiprecious stone
subtype: #turquoise a blue to gray green mineral consisting of copper aluminum phosphate; blue turquoise is valued as a gemstone
subtype: #transparent_gem a gemstone having the property of transmitting light without serious diffusion
subtype: #garnet any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive
subtype: #almandite__almandine a deep red garnet consisting of iron aluminum silicate
subtype: #andradite a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone
subtype: #demantoid a green andradite used as a gemstone
subtype: #carbuncle.garnet deep-red cabochon-cut garnet cut without facets
subtype: #cinnamon_stone__essonite__hessonite a garnet ranging in color from yellow to brown
subtype: #pyrope a deep red garnet used as a gemstone
subtype: #rhodolite a red or pink variety of garnet used as a gemstone
subtype: #amethyst a transparent purple variety of quartz; used as a gemstone
subtype: #aquamarine a transparent variety of beryl that is blue green in color
subtype: #chalcedony__calcedony a milky or grayish translucent to transparent quartz
subtype: #agate an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
subtype: #moss_agate an agate with brown, black, or green moss-like markings
subtype: #bloodstone__heliotrope green chalcedony with red spots that resemble blood
subtype: #carnelian__cornelian a translucent red or orange variety of chalcedony
subtype: #chrysoprase a green variety of chalcedony valued as a gemstone
subtype: #onyx a chalcedony with alternating black and white bands; used in making cameos
subtype: #sardonyx an onyx characterized by parallel layers of sard and a different colored mineral
subtype: #plasma.chalcedony a green slightly translucent variety of chalcedony used as a gemstone
subtype: #sard__sardine__sardiu a deep orange-red variety of chalcedony
subtype: #chrysolite a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone
subtype: #peridot a pale green variety of chrysolite; used as a gemstone
subtype: #chrysoprase a green variety of chalcedony valued as a gemstone
subtype: #citrine semiprecious yellow quartz resembling topaz
subtype: #adamant__diamond very hard native crystalline carbon valued as a gem
subtype: #black_diamond__blackdiamond__carbonado an inferior dark diamond used in industry for drilling and polishing
subtype: #emerald.beryl a green transparent form of beryl; highly valued as a gemstone
subtype: #kunzite a pinkish lilac crystal form of the mineral spodumene that is used as a gemstone
subtype: #moonstone a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar
subtype: #morganite a kind of pink beryl used as a gemstone
subtype: #peridot a pale green variety of chrysolite; used as a gemstone
subtype: #ruby.corundom a transparent deep red variety of corundum; used as a gemstone and in lasers
subtype: #water_sapphire__watersapphire a deep blue cordierite often used as a gemstone
subtype: #sapphire.corundom a precious transparent stone of rich blue corundum valued as a gemstone
subtype: #star_sapphire a sapphire that when cut shows a star-like figure in reflected light because of its crystalline structure
subtype: #hiddenite a green transparent form of the mineral spodumene used as a gemstone
subtype: #sunstone__aventurine a translucent quartz spangled with bits of mica or other minerals
subtype: #goldstone aventurine spangled densely with fine gold-colored particles
subtype: #topaz a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstone
subtype: #tourmaline a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones
subtype: #water_ice.crystal__waterice__ice water frozen in the solid state; "Americans like ice in their drinks"
subtype: #black_ice a thin coating of ice (as from freezing mist) on a road or sidewalk; nearly invisible but very hazardous
subtype: #hoar__frost__hoarfrost__rime ice crystals forming a white deposit (especially on objects outside)
subtype: #hailstone small pellet of ice that falls during a hailstorm
subtype: #icicle a pendent spear of ice formed by the freezing of dripping water
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