mineral

Quartz crystal cluster

Quartz, silicon dioxide (SiO₂); likely pale amethyst or iron-stained quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; transparent to translucent with a glassy luster, colorless to pale lavender, and hexagonal crystal structure. Quartz lacks cleavage and has uneven to conchoidal fracture; the dark base may be matrix or iron/manganese staining.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids cool in cavities and fractures, commonly in igneous or metamorphic rocks. Quartz is geologically widespread from Precambrian to modern deposits; the image alone cannot establish a precise age.

Uses & applications

Used for glass, electronics, abrasives, optical components, and gemstones; attractive clusters are mainly sold as mineral specimens and décor.

Geological facts

The pointed terminations and six-sided prism faces are characteristic of quartz. Purple coloration is caused by trace elements and irradiation, though this specimen appears only weakly colored.

Field identification & locations

Identify by its pointed hexagonal crystals, glassy luster, hardness, and absence of cleavage; it can scratch glass but not be scratched by a steel knife. Common sources include Brazil, Madagascar, the United States, and Mexico.