mineral

Tumbled blue jasper or blue-dyed jasper

Microcrystalline quartz (chalcedony), SiO₂; blue coloration may be natural or dye-enhanced

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque blue-gray with tan/brown matrix, vitreous to waxy luster, cryptocrystalline structure, no visible cleavage, specific gravity about 2.6. The smooth rounded shape indicates tumbling and polishing.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater replaces or fills cavities in volcanic or sedimentary rocks, commonly with iron-oxide matrix; deposits range from Precambrian to younger ages. Strong, uniform blue may indicate dye treatment rather than natural color.

Uses & applications

Used for inexpensive cabochons, beads, carvings, lapidary ornaments, and decorative objects; not typically used as a construction stone.

Geological facts

Jasper is an opaque variety of chalcedony and is technically quartz, though impurities create its colors and patterns. Blue varieties are often marketed as blue jasper, ocean jasper, or dyed jasper.

Field identification & locations

Identify by its opaque appearance, quartz-like hardness, lack of cleavage, and earthy matrix; it should scratch glass but not be scratched by a steel knife. Common sources include India, Madagascar, Brazil, and the United States; dye may concentrate in cracks or porous areas.