sedimentary
Orange Moss Agate / Carnelian Agate
Silicon dioxide (SiO2) - variety Chalcedony
Hardness: 6.5-7 on Mohs scale. Color: Translucent orange to white. Luster: Vitreous to waxy. Crystal system: Hexagonal (trigonal) microcrystalline. Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Color
- Translucent orange to white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Translucent orange to white. Luster: Vitreous to waxy. Crystal system: Hexagonal (trigonal) microcrystalline. Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed in volcanic and metamorphic environments as a primary precipitate from silica-rich groundwater filling cavities (vugs) in volcanic lava flows or sedimentary rocks. This formation often takes millions of years as layers of silica accumulate.
Uses & applications
Used extensively in jewelry (cabochons, beads), decorative carvings, paperweights, and metaphysical collections.
Geological facts
Agate has been used by ancient civilizations for over 3,000 years for protective amulets and seals. It is named after the Achates River in Sicily where it was first discovered.
Field identification & locations
Identify in the field by its waxy luster, translucency, and inability to be scratched by a steel knife. Common locations include Brazil, India, and the Pacific Northwest of the USA.
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