mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
Hardness: 6.5-7 (Mohs), Color: Translucent yellow to honey-orange, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline quartz), Cleavage: None, Specific Gravity: 2.60-2.65
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Translucent yellow to honey-orange, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline quartz), Cleavage: None, Specific Gravity: 2.60-2.65
Formation & geological history
Formed in cavities of volcanic rocks or sedimentary environments through the deposition of silica-rich groundwater. Age ranges from recently formed to millions of years old.
Uses & applications
Used primarily in lapidary arts, jewelry (cabochons, beads), and as a decorative or metaphysical stone in crystal collections.
Geological facts
Yellow chalcedony is part of the quartz family. When it shows banding, it is technically an agate; without banding, it is simply chalcedony. It has been used for seals and amulets since ancient times.
Field identification & locations
Identify by its waxy luster, hardness (it will scratch glass), and lack of visible crystal grains. Often found as river-worn pebbles or within geodes in volcanic regions globally.
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