mineral

Agate (Beads and Pebble)

Banded Chalcedony (SiO2)

Hardness 6.5–7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline hexagonal quartz structure, and distinct concentric or eye-like banding.

Identified October 23, 2026More mineral →

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Physical properties

Hardness 6.5–7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline hexagonal quartz structure, and distinct concentric or eye-like banding.

Formed by precipitation of silica from groundwater within cavities of volcanic or sedimentary rocks over millions of years.

Predominantly shaped, carved, and drilled into ornamental jewelry, beads, amulets, and collected as tumble stones.

Naturally banded agates have been crafted into protective 'eye beads' or talismans by human cultures for thousands of years.

Identified by concentric bands, waxy luster, lack of cleavage, and ability to scratch glass; found worldwide in volcanic deposits and gravel beds.

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Limonite

FeO(OH)•nH2O

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Feldspar

Feldspar Group (Tectosilicate, e.g., KAlSi3O8)

Tumbled granite

Granite, a coarse-grained felsic intrusive igneous rock

Pegmatite with Tourmaline and Quartz

Igneous Pegmatite