sedimentary

Picture Jasper

Silicified volcanic tuff and jasper; chiefly microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque cream, tan, yellow, and brick-red bands with a waxy to dull luster. Massive, fine-grained, with no visible cleavage; fractures are irregular to conchoidal.

Identified September 17, 2026More sedimentary →

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Physical properties

Hardness about 6.5–7 Mohs; opaque cream, tan, yellow, and brick-red bands with a waxy to dull luster. Massive, fine-grained, with no visible cleavage; fractures are irregular to conchoidal.

Formation & geological history

Formed when silica-rich fluids silicified volcanic ash or tuff, incorporating iron oxides that produce the red and yellow coloration. These jasper deposits are generally Cenozoic to older, depending on locality, and commonly occur in volcanic terrains.

Uses & applications

Used for cabochons, slabs, carvings, bookends, and decorative objects; attractive patterned pieces have modest lapidary value.

Geological facts

Its landscape-like banding is the defining feature of picture jasper, and each slab can display unique scenic patterns. The red color typically reflects hematite or related iron oxides.

Field identification & locations

Identify it by its opaque scenic patterns, very fine texture, lack of visible grains, and ability to scratch glass; it will not fizz in dilute hydrochloric acid. Common sources include Oregon, Idaho, Utah, Arizona, and Mexico.