Rock Identifier
Plume Agate (Cryptocrystalline Quartz (SiO2)) — Mineral/Gemstone
Mineral/Gemstone

Plume Agate

Cryptocrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on the Mohs scale, Color: Translucent to opaque with pinkish/peach plume-like inclusions, Luster: Vitreous to waxy, Crystal structure: Trigonal (microcrystalline), Cleavage: None, Specific gravity: 2.58-2.64

Hardness
6
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Physical properties

Hardness: 6.5-7 on the Mohs scale, Color: Translucent to opaque with pinkish/peach plume-like inclusions, Luster: Vitreous to waxy, Crystal structure: Trigonal (microcrystalline), Cleavage: None, Specific gravity: 2.58-2.64

Formation & geological history

Formed in cavities or vesicles of volcanic rocks, where silica-rich fluids slowly deposited layers of microcrystalline quartz along with mineral impurities (like iron oxides) that create the plume formations.

Uses & applications

Primarily used in lapidary arts for jewelry, cabochons, and ornamental objects.

Geological facts

Plume agates are prized for their 3D mossy or feather-like inclusions, which are technically not organic but formed by mineral growth within the silica matrix.

Field identification & locations

Identified by its distinctive plume inclusions within a translucent chalcedony base. Commonly found in areas with past volcanic activity.

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