sedimentary

Banded Agate

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 Mohs; Color: White and light blue-grey bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microscopic); Cleavage: None/Conchoidal fracture.

Hardness: 6
Color: White and light blue-grey bands
Luster: Waxy to vitreous

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: White and light blue-grey bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microscopic); Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed by the deposition of silica from groundwater in the cavities (vesicles) of igneous or sedimentary rocks. This specimen is likely from a secondary deposit found in riverbeds or volcanic regions, formed millions of years ago.

Uses & applications

Used extensively in jewelry making, lapidary arts, spiritual practices, and as decorative tumbled stones for collection.

Geological facts

Agate is named after the Achates River in Sicily. It is one of the oldest gemstones used in history, with Greek and Sumerian civilizations using it for seal stones and amulets.

Field identification & locations

Identified by its distinctive concentric or parallel bands and translucency. Common locations include Brazil, India, and the United States. In the field, look for smooth, waxy-surfaced nodules in gravel bars or volcanic outcrops.