sedimentary

Banded Jasper (Mookaite / Chert)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands showing mustard yellow, reddish-purple, and cream tones; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.58-2.64

Hardness: 6
Luster: Waxy to vitreous

Identified July 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the precipitation of silica in fine-grained sedimentary environments or chemical replacement of radiolarian oozes and mudstones. Prominent in Western Australia (Mooka Creek) and various sedimentary basin settings.

Uses & applications

Popular for lapidary work, cabochons, tumbled stones, polished decorative pieces, and mineral collections.

Geological facts

Jasper is a opaque, impure variety of silica. The distinct color banding is caused by varying concentrations of iron oxides, hydroxides, and clay minerals deposited during formation.

Field identification & locations

Identified by its microcrystalline texture, distinct multi-colored opacity, smoothness, waxy luster, and smooth conchoidal fracture. Common in gravel beds, stream deposits, and weathered sedimentary outcrops worldwide.

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