sedimentary
Agatized or Silicified Fossil/Coral, or Jasper
SiO2
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Orange, reddish-brown, yellow, with dark veining. Luster: Vitreous to waxy. Crystal structure: Cryptocrystalline. Cleavage: None, conchoidal fracture.
- Hardness
- 6
- Color
- Orange, reddish-brown, yellow, with dark veining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Orange, reddish-brown, yellow, with dark veining. Luster: Vitreous to waxy. Crystal structure: Cryptocrystalline. Cleavage: None, conchoidal fracture.
Formation & geological history
Formed by silica replacing organic material or forming in sedimentary environments. Often found in riverbeds or beaches where they have been naturally tumbled.
Uses & applications
Used in lapidary arts, jewelry making, and collecting.
Geological facts
The red patch in the center is likely chalcedony or jasper filling a void.
Field identification & locations
Identify by its waxy luster, hardness (cannot be scratched by a steel nail), and lack of cleavage. Commonly found in areas with past volcanic or sedimentary activity.
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