mineral

Small quartz crystal fragment

Quartz (silicon dioxide, SiO₂), possibly iron-stained or included quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent to transparent with a colorless-to-pale brown appearance and vitreous luster. Quartz has a trigonal crystal structure and lacks cleavage, breaking with conchoidal fracture; exact specific gravity is about 2.65.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in cavities, veins, or igneous rocks; the brown coloration may result from iron-oxide staining. Quartz occurs from Precambrian rocks to modern hydrothermal deposits, but the specimen’s age cannot be determined visually.

Uses & applications

Used extensively in glass, ceramics, abrasives, electronics, and watches; attractive crystals are collected or used in inexpensive jewelry. This very small fragment has minimal commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. The image is too small and lacks scale or diagnostic crystal faces for a confident variety identification.

Field identification & locations

Common worldwide, especially in granite pegmatites, hydrothermal veins, geodes, and sandstone. Confirm with hardness testing against glass and inspection for quartz-like conchoidal fracture; avoid damaging a potentially valuable specimen.