sedimentary

Tumbled Agate

Cryptocrystalline Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs), Color: Multicolored (blue, grey, purple, green), Luster: Waxy to Vitreous (when polished), Crystal Structure: Trigonal (microcrystalline), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.58-2.64

Hardness: 6

Identified July 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in silica-rich groundwater filling cavities in volcanic or sedimentary rocks. Over millions of years, microcrystalline quartz layers deposit rhythmically, creating concentric bands or moss-like inclusions.

Uses & applications

Ornamental use, jewelry, lapidary art, tumble polishing for collections, and metaphysical healing practices.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered. It is one of the most diverse gemstones in terms of color and pattern. This specimen appears to be a tumbled and possibly dyed or heat-treated variety often sold as 'Dragon Vein' or 'Peacock' style agate.

Field identification & locations

Identified by its waxy texture, translucent to opaque body, and characteristic banding or dendritic inclusions. Commonly found in Brazil, India, and the United States. In the field, look for nodules with a rough, weathered exterior but glassy interior when broken.

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Sandstone or Siltstone

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Mudstone

Argillite / Siliciclastic sedimentary rock

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Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

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Brown Sandstone (River Rock)

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Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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