metamorphic
Brecciated jasper (likely silicified breccia)
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide matrix and lithic fragments
AI-generated identification · may be incorrectOpaque tan, cream, reddish-brown, and gray angular fragments in a silica-rich matrix; typically Mohs 6.5–7, waxy to dull luster, very fine-grained with no visible cleavage, and specific gravity around 2.5–2.7.
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Physical properties
Opaque tan, cream, reddish-brown, and gray angular fragments in a silica-rich matrix; typically Mohs 6.5–7, waxy to dull luster, very fine-grained with no visible cleavage, and specific gravity around 2.5–2.7.
Formation & geological history
Forms when silica-rich fluids cement and replace fractured rock, commonly during hydrothermal activity; exact geological age cannot be determined from the photograph. It may also represent silicified volcanic or sedimentary breccia.
Uses & applications
Used as ornamental stone, cabochons, beads, carvings, lapidary slabs, and inexpensive collector material; occasionally used for decorative aggregate.
Geological facts
The angular clasts and contrasting colors are characteristic of brecciation, while reddish tones generally reflect hematite or other iron oxides. The specimen appears naturally weathered rather than highly polished.
Field identification & locations
Identify in the field by its hardness, inability to scratch with a steel knife, opaque chalcedony-like texture, and angular clasts cemented by silica; common in hydrothermal and volcanic districts worldwide. Vinegar will not react, unlike carbonate rocks.
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