mineral
Grape Agate
Chalcedony (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on the Mohs scale; Color: Purple, green, white, blue; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None; Specific gravity: 2.58-2.66
- Hardness
- 6
- Color
- Purple, green, white, blue
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Purple, green, white, blue; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None; Specific gravity: 2.58-2.66
Formation & geological history
Formed as botryoidal chalcedony in hydrothermal environments and cavities of volcanic rocks, where silica-rich fluids deposit microcrystalline quartz in spherical, grape-like clusters over millions of years.
Uses & applications
Primarily collected as a decorative mineral specimen, used in display pieces, and sometimes crafted into unique jewelry.
Geological facts
Despite its popular trade name 'Grape Agate', this mineral is technically a botryoidal chalcedony rather than true banded agate. It gained massive popularity among collectors following major discoveries in Indonesia in recent years.
Field identification & locations
Easily identified by its distinctive botryoidal (bubble or grape-like) aggregate habit and soft purple or variegated coloration. Found notably in Sulawesi, Indonesia.
