mineral

Natural quartz crystal (likely herkimer-style quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically colorless and transparent with a glassy luster, hexagonal crystal structure, and no true cleavage; Mohs hardness 7, specific gravity about 2.65. The specimen appears to be a small, rough, water-clear crystal, though the image is insufficient for definitive identification.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids or cavities in igneous and sedimentary rocks; individual crystals may range from ancient to geologically recent. Double-terminated forms are characteristic of cavity-grown specimens such as Herkimer-type quartz.

Uses & applications

Used for collecting, crystal displays, metaphysical purposes, and as a source of industrial silica; clear faceted quartz is also used as a gemstone. It has limited value unless exceptionally clear, well-formed, or unusual.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly forms hexagonal prisms ending in pyramidal faces. Clear quartz can be confused with glass, but quartz is harder and often shows natural crystal faces or internal inclusions.

Field identification & locations

Commonly found in Brazil, Madagascar, the United States, China, and Arkansas/New York; identify by hardness, glassy luster, and crystal form. A scratch test against glass can help, but may damage the specimen.