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Colored Stones 20
Quartz and Chalcedony
8
Geology
Post-Graduate
08/28/2018

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Term
Agate
Definition
chalcedony with curved or angular bands or layers that differ in color and transparency
Term
Botryoidal
Definition
a crystal growth habit with a bumpy appearance similar to a bunch of grapes
Term
Chalcedony
Definition
a cryptocrystalline quartz aggregate
Term
Piezoelectricity
Definition
a property of some crystals that causes them to vibrate at a constant frequency when subjected to an electrical current
Term
Rutilated Quartz
Definition
a type of sagenitic quartz containing needle-like rutile inclusions
Term
Sagenitic Quartz
Definition
transparent quartz, usually rock crystal, that contains eye-visible inclusions, often named according to the type of inclusions it contains
Term
Signet
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
Term
Tourmalinated Quartz
Definition
a type of sagenitic quartz containing needle-like or rod-like tourmaline inclusions
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