sedimentary

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with Hematite impurities

Hardness: 6.5-7 (Mohs scale); Color: Red, white, and gray mottled; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Trigonal (Cryptocrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.9

Hardness: 6
Color: Red, white, and gray mottled
Luster: Dull to vitreous

Identified June 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the precipitation of silica in sedimentary environments or through volcanic hydrothermal processes. The red coloration is due to the presence of iron oxide (hematite). This specimen appears to have secondary quartz crystallization in vugs and fractures.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), interior decoration, and as a popular specimen for rock collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' originated from the Greek word 'iaspis', meaning spotted stone. It has been used for seals and amulets since the Minoan civilization.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), its waxy to dull luster, and the distinctive conchoidal (shell-like) fracture pattern. Commonly found in riverbeds or desert regions of the Southwest USA.

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