mineral
Polished Agate (Yellow/Grey Agate Pendant)
Silicon Dioxide (SiO2)
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
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Physical properties
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).
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.
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