mineral

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Hardness: 6.5–7 on Mohs scale; Color: Translucent yellow, honey, and light grey bands; Luster: Waxy to vitreous; Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.64

Hardness: 6
Color: Translucent yellow, honey, and light grey bands
Luster: Waxy to vitreous

Identified January 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary mineral in volcanic rock cavities (vesicles) or sedimentary rock through the deposition of silica-rich groundwater. Over millions of years, concentric layers of chalcedony fill these voids.

Uses & applications

Used extensively in jewelry (cabochons, beads), decorative carvings, and industrially for mortar and pestles due to its hardness and resistance to chemicals. Also a popular collector's item.

Geological facts

Agates are named after the Achates River in Sicily where they were first found. Every agate is unique due to the specific mineral impurities present during its slow crystallization process.

Field identification & locations

Identify in the field by its waxy appearance, translucency when held to light, and characteristic curved (conchoidal) fractures. Common in riverbeds, desert pavements, and volcanic regions globally.

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