mineral

Banded agate (likely fire agate)

Microcrystalline quartz, SiO₂, commonly chalcedony with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; reddish-brown, orange, cream, and dark gray banding; waxy to vitreous luster; cryptocrystalline structure; no cleavage, conchoidal fracture; specific gravity about 2.60.

Identified September 11, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; reddish-brown, orange, cream, and dark gray banding; waxy to vitreous luster; cryptocrystalline structure; no cleavage, conchoidal fracture; specific gravity about 2.60.

Formation & geological history

Forms when silica-rich groundwater fills cavities in volcanic rock, depositing chalcedony and quartz in successive layers; iron oxides create the red-orange colors. Most examples formed in Cenozoic volcanic terrains, commonly tens of millions of years old.

Uses & applications

Used for cabochons, beads, carvings, bookends, and ornamental specimens; attractive fire agate may be valuable in jewelry.

Geological facts

The visible rough surfaces and translucent orange-red zones are consistent with agate, though the photograph alone cannot confirm fire-agate iridescence or locality.

Field identification & locations

Identify by concentric or irregular silica banding, translucent edges, glassy/waxy luster, and hardness sufficient to scratch glass. Common sources include Arizona, Mexico, Brazil, Uruguay, and India; acid testing is unnecessary and can damage it.