mineral

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically colorless and transparent with a vitreous luster, hexagonal crystal structure, and conchoidal fracture; Mohs hardness 7 and specific gravity about 2.65. The specimen appears to be a small natural or broken quartz crystal, though the image is insufficient to confirm its exact form.

Identified August 27, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous or metamorphic rocks; individual crystals may range from very old Precambrian formations to young geologic deposits. It commonly forms in cavities, veins, and drusy coatings.

Uses & applications

Used in glass, engineered stone, electronics, watches, abrasives, and optical instruments; clear crystals are also sold as decorative or metaphysical specimens. Small ordinary pieces have minimal commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and has two major varieties: low quartz stable below 573°C and high quartz above that temperature. Its piezoelectric properties allow it to generate an electrical charge under pressure.

Field identification & locations

Identify it by its glassy appearance, hardness, lack of cleavage, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common localities include Brazil, Madagascar, Arkansas, the Alps, and many worldwide vein deposits.