sedimentary

Agate (River Pea)

Microcrystalline Chalcedony (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5–7 on the Mohs scale. Color: Translucent honey-yellow to brownish-orange. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.60–2.64.

Hardness: 6
Color: Translucent honey-yellow to brownish-orange
Luster: Waxy to vitreous

Identified March 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5–7 on the Mohs scale. Color: Translucent honey-yellow to brownish-orange. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.60–2.64.

Formation & geological history

Formed in volcanic cavities or sedimentary pockets where silica-rich groundwater deposits layers over thousands of years. This specimen has been naturally tumbled and rounded by river or alluvial action over geological time.

Uses & applications

Used in lapidary work for cabochons and beads, industrial mortars and pestles due to its hardness, and highly valued by rockhounds for tumbling and aesthetic collecting.

Geological facts

Agates are traditionally associated with healing and strength. Many river-found agates in the Pacific Northwest are known as 'Carnelian' when they exhibit this specific warm, translucent orange hue.

Field identification & locations

Identify in the field by checking for translucency against the sun (backlighting) and a smooth, waxy feel compared to surrounding dull rocks. Commonly found on riverbanks, gravel bars, and beaches.