gemstone

Faceted clear quartz (rock crystal), likely a cut imitation or low-grade gemstone

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Colorless and transparent with vitreous luster and numerous triangular/step-like facet reflections. Quartz is Mohs hardness 7, specific gravity about 2.65, and has no cleavage but conchoidal fracture; the photographed item is cut and polished, so natural crystal faces are absent.

Identified September 12, 2026More gemstone →

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Physical properties

Formation & geological history

Natural quartz forms in hydrothermal veins, pegmatites, and cavities, commonly from the Precambrian through recent geological time. Its rounded faceted shape indicates human processing rather than a naturally exposed crystal.

Uses & applications

Used as an inexpensive gemstone, ornamental object, and collector specimen; quartz is also important in glass, ceramics, electronics, and precision oscillators. Value is usually modest unless clarity, size, and cutting quality are exceptional.

Geological facts

Quartz can resemble diamond, glass, or synthetic cubic zirconia. Unlike diamond, it scratches more easily and typically shows doubled facet edges under magnification because of quartz’s birefringence.

Field identification & locations

Common sources include Brazil, Madagascar, the United States, and Arkansas. Check for facet precision, bubbles, scratches, and refractive doubling; hardness testing should be done cautiously because it can damage the specimen.