gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness: 6.5 - 7 on the Mohs scale. Color: White, gray, translucent with fine banding. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None. Specific gravity: 2.58 - 2.64.
- Hardness
- 6
- Color
- White, gray, translucent with fine banding
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5 - 7 on the Mohs scale. Color: White, gray, translucent with fine banding. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None. Specific gravity: 2.58 - 2.64.
Formation & geological history
Formed by the deposition of silica from groundwater in the cavities of igneous and metamorphic rocks, typically over millions of years.
Uses & applications
Widely used in jewelry making as cabochons, carved ornaments, decorative items, and metaphysical practices.
Geological facts
Agate has been used since ancient times, notably by the ancient Greeks and Romans for intaglio rings and medicinal amulets.
Field identification & locations
Easily identified by its distinctive concentric color banding and translucent appearance. Found worldwide, with major deposits in Brazil, Uruguay, India, and the USA.
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