Red Jasper

Physical Properties

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.

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.

Identified on: 4/30/2026

Mode: Standard