sedimentary
Yellow Agate (Chalcedony)
Silicon Dioxide (SiO2)
Hardness: 6.5-7 (Mohs scale); Color: Pale yellow to golden honey; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Pale yellow to golden honey
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale yellow to golden honey; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.64
Formation & geological history
Formed through the deposition of silica from groundwater in cavities within volcanic or sedimentary rocks. This specific specimen has been polished into a cabochon shape.
Uses & applications
Commonly used in jewelry as cabochons, beads, or decorative carvings. Also valued in gemstone collecting and metaphysical practices.
Geological facts
Agate is a variety of chalcedony characterized by its microcrystalline structure. While usually banded, solid-colored varieties like this yellow specimen are often called 'Yellow Chalcedony' or 'Yellow Agate' depending on regional trade names.
Field identification & locations
Identify by its waxy luster, smoothness when polished, and high hardness (it will scratch glass). Commonly found in Brazil, India, and the United States. Collectors should look for even color distribution and translucency.
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