sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Mohs hardness: 6.5-7; Color: brick red to brownish red due to iron inclusions; Luster: dull to vitreous (often waxy when polished); Crystal System: Trigonal (Microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91.

Hardness: 6
Color: brick red to brownish red due to iron inclusions
Luster: dull to vitreous (often waxy when polished)

Identified April 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms in hydrothermal environments or through the deposition of silica-rich fluids in volcanic ash or sedimentary beds. The red color is caused by finely dispersed iron (hematite) inclusions within the silica.

Uses & applications

Widely used for carvings, cabochons for jewelry, decorative ornaments, and as a popular stone for tumbling and collecting.

Geological facts

Jasper has been used for millennia; in ancient times, it was considered a 'rain bringer' and was frequently used in cylinder seals and amulets. It is a variety of chalcedony.

Field identification & locations

Identify in the field by its opacity (even on thin edges), its hardness (will scratch glass), and its distinctive brick-red color. Very common in desert regions and riverbeds worldwide.