mineral

Polished Agate (Yellow/Grey Agate Pendant)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Grey, yellowish-brown, tan, milky translucent; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline/Cryptocrystalline trigonal; Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Grey, yellowish-brown, tan, milky translucent
Luster: Vitreous to waxy

Identified July 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary mineral in volcanic host rocks through the deposition of silica from groundwater filling cavities (vesicles).

Uses & applications

Used primarily in lapidary arts, jewelry (pendants, beads), cabochons, carved ornaments, and spiritual/healing stone practices.

Geological facts

Agate is a microcrystalline variety of quartz, characterized by its fine grain and brightness of color. Each piece features unique naturally occurring patterns and inclusions.

Field identification & locations

Identified by its waxy luster, hardness (scratches glass), smooth conchoidal fracture when unpolished, and characteristic banding or cloud-like translucent inclusions. Commonly found in Brazil, Uruguay, India, Madagascar, and the USA.