Sedimentary/Mineral

Jasper

Chalcedony (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7, Color: Opaque dark matrix with reddish-brown to tan brecciated veins or inclusions, Luster: Vitreous to dull, Crystal structure: Microcrystalline quartz, Cleavage: None

Hardness: 6

Identified June 18, 2026More sedimentary/mineral →

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Physical properties

Hardness: 6.5-7, Color: Opaque dark matrix with reddish-brown to tan brecciated veins or inclusions, Luster: Vitreous to dull, Crystal structure: Microcrystalline quartz, Cleavage: None

Formation & geological history

Forms in vein fillings or as nodules in sedimentary rocks or volcanic rocks where silica-rich waters percolate. Brecciated patterns form when the rock is fractured and later cemented by silica.

Uses & applications

Commonly used in jewelry making (cabochons, pendants, beads) and lapidary arts.

Geological facts

Jasper comes in many local varieties named for their patterns or locations. The specimen shown appears to be a brecciated jasper or perhaps a type of coquina jasper (Script stone) depending on the specific inclusions.