mineral

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically colorless and transparent to translucent, with a vitreous luster and hexagonal crystal structure; hardness 7 Mohs, no true cleavage, conchoidal fracture, and specific gravity about 2.65. The specimen appears naturally crystallized but may be partially broken or lightly processed.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or cooling igneous melts deposit quartz in cavities, veins, and pegmatites; quartz occurs from Precambrian rocks to modern deposits. Common sources include Brazil, Arkansas, Madagascar, and the Alps.

Uses & applications

Used in glassmaking, electronics, abrasives, scientific instruments, and ornamental collecting; clear crystals are also used in jewelry and metaphysical displays.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Natural points commonly show six-sided prisms ending in pyramidal faces.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and often six-sided crystal faces. Value depends on clarity, intactness, size, and locality; this hand-sized ordinary specimen is commonly worth about $5-$30 USD.