mineral

Quartz crystal cluster (likely rose or milky quartz)

Quartz, silicon dioxide (SiO₂); trigonal crystal system

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to pale pink, vitreous luster, generally conchoidal fracture, no cleavage, specific gravity about 2.65. The specimen appears to be a small irregular cluster of intergrown quartz crystals, possibly lightly iron-stained or containing inclusions.

Identified September 1, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and cavities in igneous or metamorphic rocks; individual crystals may form over long periods from Precambrian to recent geological ages. Its pale pink color can result from trace inclusions or irradiation-related defects.

Uses & applications

Used for glass, electronics, optical instruments, abrasives, and engineered quartz; attractive clusters are sold as mineral specimens and occasionally used decoratively.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of the Mohs hardness scale at 7. It commonly forms six-sided prisms terminated by pyramidal faces, though this specimen’s crystals are poorly developed.

Field identification & locations

Identify by its glassy luster, hardness, lack of cleavage, and inability to scratch with a steel knife while scratching ordinary glass. Common sources include Brazil, Madagascar, the United States, and Alpine regions.