mineral

Likely quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Appears translucent pale blue-green under strong colored lighting, with a vitreous luster and irregular fracture; likely Mohs hardness 7, lacking cleavage, and trigonal crystal structure. The intense cyan coloration may be photographic lighting or a surface coating rather than natural color.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and cavities in igneous or metamorphic rocks, ranging from Precambrian to recent formations. The specimen appears broken or partly shaped rather than a complete crystal.

Uses & applications

Quartz is used in glass, ceramics, abrasives, electronics, and watches; attractive transparent pieces are sold as mineral specimens or occasionally cut as gemstones.

Geological facts

Quartz is one of Earth’s most abundant minerals and is commonly identified by its hardness and conchoidal fracture. Natural blue quartz is uncommon; vivid turquoise-blue appearance often results from lighting, dye, or coating.

Field identification & locations

Test an inconspicuous edge against glass: genuine quartz should scratch it, while a steel blade generally will not scratch quartz. Common sources include Brazil, Madagascar, the United States, and alpine hydrothermal veins.