gemstone
Plume Agate
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale with a waxy to vitreous luster. Features delicate, feather-like inclusions of manganese or iron oxides suspended in chalcedony.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale with a waxy to vitreous luster. Features delicate, feather-like inclusions of manganese or iron oxides suspended in chalcedony.
Formation & geological history
Formed in cavities of volcanic rocks by the deposition of silica-rich groundwater over millions of years.
Uses & applications
Used primarily in lapidary arts, jewelry, decorative slabs, and mineral collections.
Geological facts
The vibrant red and orange plume structures are actually fossilized mineral dendrites trapped during crystal growth.
Field identification & locations
Identified by translucent chalcedony combined with distinct internal plume or moss-like patterns. Commonly sourced from Oregon, Idaho, and Mexico.
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