A type of onyx, which is an agate with parallel bands. Sardonyx has layers of brownish sard (red carnelian) alternating with lighter-color layers of onyx. Often used as a gemstone, it has been mined or gathered since before 2200 BCE.
Synonyms and Related Terms
onyx; quartz; agate; chalcedony
Fracture = conchoidal. Luster = vitreous to waxy. Streak = white.
Mineralogy Database: Quartz
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