mineral
Chalcedony (Agate nodule fragment)
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: translucent pale orange to milky beige/white; Luster: waxy to vitreous; Structure: microcrystalline/cryptocrystalline trigonal quartz; Cleavage: none (conchoidal fracture); Specific Gravity: ~2.6
- Hardness
- 6
- Color
- translucent pale orange to milky beige/white
- Luster
- waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: translucent pale orange to milky beige/white; Luster: waxy to vitreous; Structure: microcrystalline/cryptocrystalline trigonal quartz; Cleavage: none (conchoidal fracture); Specific Gravity: ~2.6
Formation & geological history
Formed through deposition of silica from groundwater inside cavities (vesicles) of volcanic rocks or sedimentary formations over millions of years.
Uses & applications
Used in gemstone carving, lapidary arts, jewelry (cabochons), and as collectable mineral specimens.
Geological facts
Chalcedony is composed of microscopic intergrowths of quartz and moganite. Translucent varieties like this often show subtle banding or waxy texture when light passes through.
Field identification & locations
Look for translucency, waxy luster, and lack of cleavage planes. Found worldwide in volcanic terrains, gravel beds, and desert pavements.
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