mineral
Chalcedony (Agate/Common Opal blend)
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 Mohs; Color: Translucent white to bluish-grey; Luster: Waxy to vitreous; Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6
- Hardness
- 6
- Color
- Translucent white to bluish-grey
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Translucent white to bluish-grey; Luster: Waxy to vitreous; Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6
Formation & geological history
Formed via precipitation from silica-rich hydrothermal fluids in volcanic rock cavities or sedimentary nodes. Found in the Trans-Mexican Volcanic Belt (Hidalgo/Queretaro region).
Uses & applications
Used for lapidary work, jewelry (cabochons), and as a collector's specimen due to its translucency.
Geological facts
This specimen displays the typical 'waxy' appearance of chalcedony. The location (20.7N, 99.9W) is in the state of Queretaro, Mexico, famous for its opal and chalcedony deposits.
Field identification & locations
Identify by its waxy luster, lack of visible crystals, and ability to scratch glass. Found in volcanic gravels or as nodules in basalt.
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