mineral

Grape Agate

Chalcedony (Silicon Dioxide, SiO2)

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

Hardness: 6
Color: Purple, green, white, blue
Luster: Vitreous to waxy

Identified August 7, 2026More mineral →

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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.