Red Moss Agate or Jasper-Agate

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: Red, white, and translucent; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None, conchoidal fracture; Specific gravity: 2.60-2.65.

Formation & Geological History

Formed from hydrothermal deposits of silica-rich fluids filling cavities (vugs) in volcanic or sedimentary rocks. The red coloring is caused by iron oxide inclusions, while the white/clear areas are chalcedony/agate.

Uses & Applications

Used primarily in lapidary arts for jewelry, pocket stones, decorative ornaments, and as a collector's specimen.

Geological Facts

Agates and Jaspers are both varieties of chalcedony. When a specimen contains both clear/translucent silica and opaque iron-rich silica, it is often referred to as a 'Jasp-Agate'.

Field Identification & Locations

Identify by its hardness (cannot be scratched by steel) and lack of cleavage. Common in river beds and volcanic regions in the Western US, Brazil, and India.

Identified on: 4/16/2026

Mode: Standard