mineral

Polished agate pendant

Agate, a banded variety of microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; golden-brown and cream bands with a vitreous polish; trigonal quartz, with no visible cleavage and conchoidal fracture. The image shows a small polished stone set as jewelry.

Identified September 23, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; golden-brown and cream bands with a vitreous polish; trigonal quartz, with no visible cleavage and conchoidal fracture. The image shows a small polished stone set as jewelry.

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rocks, depositing successive layers; deposits occur across many geological ages. The pictured stone’s exact locality cannot be determined from appearance alone.

Uses & applications

Used for pendants and other jewelry, decorative objects, and collecting; agate is also used for ornamental carvings and small practical objects.

Geological facts

Agate’s fine bands form from successive silica deposits and may become visible after cutting or polishing.

Field identification & locations

Look for waxy-to-glassy luster and curved or parallel bands; common sources include Brazil, Uruguay, India, and the United States. Jewelry mounting prevents reliable field tests from the image.