Rock Identifier
Clear Quartz (Faceted) / White Sapphire / Goshenite (Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)) — gemstone
gemstone

Clear Quartz (Faceted) / White Sapphire / Goshenite

Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)

Hardness: 7 (Quartz) to 9 (Corundum) on Mohs scale. Colorless/transparent, vitreous (glassy) to adamantine luster, trigonal/hexagonal crystal system, indistinct or perfect cleavage depending on species. High transparency and brilliance.

Hardness
7 (Quartz) to 9 (Corundum) on Mohs scale
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Physical properties

Hardness: 7 (Quartz) to 9 (Corundum) on Mohs scale. Colorless/transparent, vitreous (glassy) to adamantine luster, trigonal/hexagonal crystal system, indistinct or perfect cleavage depending on species. High transparency and brilliance.

Formation & geological history

Forms in pegmatites, hydrothermal veins, and metamorphic rocks. Hydrothermal fluid cooling allows for large, eye-clean crystals to grow, which are later faceted into gemstones.

Uses & applications

Used extensively in gemstone jewelry (rings, pendants), high-end watchmaking components, and decorative faceting collections.

Geological facts

Colorless gemstones like clear quartz (rock crystal), white sapphire, or goshenite (white beryl) were historically used as natural substitutes for diamond before synthetic cubics and moissanite existed.

Field identification & locations

Identify by high clarity, precision facet junctions, brilliant refraction, and lack of color (colorless/white). Found globally in pegmatite deposits in Brazil, Madagascar, Sri Lanka, and Africa.

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