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Definition
| chalcedony with curved or angular bands or layers that differ in color and transparency |
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Definition
| a crystal growth habit with a bumpy appearance similar to a bunch of grapes |
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Definition
| a cryptocrystalline quartz aggregate |
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Definition
| a property of some crystals that causes them to vibrate at a constant frequency when subjected to an electrical current |
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Definition
| a type of sagenitic quartz containing needle-like rutile inclusions |
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Definition
| transparent quartz, usually rock crystal, that contains eye-visible inclusions, often named according to the type of inclusions it contains |
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Definition
| a table-cut gem with a flat or slightly domed top and sometimes a carved design, typically set in men's rings and cufflinks |
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Term
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Definition
| a type of sagenitic quartz containing needle-like or rod-like tourmaline inclusions |
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