mineral
Tumbled Grey Agate
Silicon Dioxide (Chalcedony variety), SiO2
Hardness: 6.5-7 on the Mohs scale; Color: Grey with mottled or banded patterns; Luster: Waxy to vitreous; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.60-2.65
- Hardness
- 6
- Color
- Grey with mottled or banded patterns
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Grey with mottled or banded patterns; Luster: Waxy to vitreous; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.60-2.65
Formation & geological history
Formed in the cavities of volcanic and metamorphic rocks through the deposition of silica-rich groundwater over millions of years.
Uses & applications
Used primarily in lapidary arts, tumbled stones, jewelry, decorative carvings, and metaphysical practices.
Geological facts
Agate has been used by humans for thousands of years, dating back to the Neolithic period, for amulets, seals, and ornaments. The grey variety is often associated with grounding and emotional balance.
Field identification & locations
Identified by its waxy luster, microcrystalline structure, conchoidal fracture, and resistance to scratching by steel. Common worldwide, particularly in Brazil, India, Madagascar, and the USA.
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