Quartz is a mineral composed by silica oxide. Transparent variety is rock crystal. Crystal cluster.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
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Keywords: background, black, close-, cluster, cristal, crystal, crystals, cuarzo, de, geology, mineralogy, oxide, piezoelectric, quartz, roca, rock, sample, silica, transparent, trigonal, vertical