quartz a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
transparent gem a gemstone having the property of transmitting light without serious diffusion
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Wiktionary
Substantiv
aventurine -
A kind of glass, containing gold-colored spangles. It was produced in the first place by the accidental par aventure dropping of some brass filings into a pot of melted glass.
aventurine -
A variety of translucentquartz, spangled throughout with scales of yellow mica.
