mineral

Botryoidal iron-rich jasper

Ferruginous jasper/chalcedony, primarily microcrystalline quartz (SiO₂) with iron oxides and hydroxides

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, with reddish-brown, orange, yellow, and black coloration; earthy to waxy or glassy luster, opaque to slightly translucent edges, and no visible cleavage. The rounded botryoidal texture and iron-rich veining are characteristic.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits chalcedony while iron minerals oxidize and stain or replace the material, commonly in volcanic cavities and hydrothermal environments. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used as a lapidary material for cabochons, carvings, polished pieces, and ornamental objects; attractive specimens are collected for color and pattern.

Geological facts

The dark red-brown colors generally reflect hematite, while yellow-brown areas may contain goethite or limonite. “Jasper” is a descriptive lapidary term rather than a single mineral species.

Field identification & locations

Identify it by its hardness, opaque silica-rich body, reddish iron staining, and conchoidal fracture; it should resist scratching by a steel knife. Common sources include volcanic districts in the western United States, Mexico, Australia, and India.