sedimentary

Yellow Agate Bottle

Cryptocrystalline Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Honey-yellow, tan, and cream; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline quartz); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.64

Hardness: 6
Color: Honey-yellow, tan, and cream
Luster: Waxy to vitreous

Identified July 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Agate forms as a secondary mineral in the cavities of volcanic or sedimentary rocks. Silica-rich groundwater percolates through voids, depositing layers of chalcedony over thousands of years. This specimen displays characteristic 'eye' or 'botryoidal' banding patterns.

Uses & applications

Commonly used in lapidary work for jewelry, cabochons, and decorative carvings. In industry, due to its hardness and chemical resistance, it is used for mortars and pestles.

Geological facts

Agates with circular banding like this are often called 'Eye Agates.' They have been used as amulets since ancient times in various cultures to ward off the 'evil eye.'

Field identification & locations

Identify by its characteristic banding, translucency when held to light, and waxy surface texture. These small water-worn nodules are frequently found in riverbeds and gravel deposits gravel deposits across the globe.