- Types:
- show 18 types...
- hide 18 types...
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quartz crystal
a thin plate or small rod of quartz cut along certain lines and ground so that it can produce an electric signal at a constant frequency; used in crystal oscillators
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rock crystal, transparent quartz
a clear quartz used in making electronic and optical equipment
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cairngorm, smoky quartz
a smoky yellow or brown quartz
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amethyst
a transparent purple variety of quartz; used as a gemstone
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calcedony, chalcedony
a milky or greyish translucent to transparent quartz
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citrine
semiprecious yellow quartz resembling topaz
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rose quartz
a translucent rose-red variety of quartz used for ornaments
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aventurine, sunstone
a translucent quartz spangled with bits of mica or other minerals
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common topaz, false topaz, topaz
a yellow quartz
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rhinestone
an imitation diamond made from rock crystal or glass or paste
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agate
an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
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bloodstone, heliotrope
green chalcedony with red spots that resemble blood
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carnelian, cornelian
a translucent red or orange variety of chalcedony
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chrysoprase
a green variety of chalcedony valued as a gemstone
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goldstone
aventurine spangled densely with fine gold-colored particles
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onyx
a chalcedony with alternating black and white bands; used in making cameos
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plasma
a green slightly translucent variety of chalcedony used as a gemstone
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sard, sardine, sardius
a deep orange-red variety of chalcedony
