mineral

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous luster, white to colorless appearance, and hexagonal crystal structure; it has indistinct cleavage and conchoidal fracture. The specimen appears to be a small, possibly coated or matrix-bearing cluster with translucent gray-clear crystals.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and cavities in volcanic rocks, commonly from Paleozoic to recent mineral deposits. Exact locality and age cannot be determined from the image.

Uses & applications

Used for glass, electronics, abrasives, and optical components; attractive clusters are collected and sometimes used decoratively. Small common specimens generally have modest value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of many geodes. Crystal tips and six-sided prismatic faces are key diagnostic features.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary glass, and six-sided crystal faces; avoid confusing it with calcite, which is softer and cleaves readily. Common sources include Brazil, Madagascar, Arkansas, China, and alpine veins.