Red Jasper
Chalcedony var. Jasper (Red) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal symmetry; typically occurs in massive, microcrystalline aggregates without visible crystal faces
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite) inclusions
Formation Process
Sedimentary or Hydrothermal; forms when silica-rich fluids permeate porous rocks or volcanic ash, incorporating iron oxides during crystallization
About This Crystal
An opaque, microcrystalline variety of quartz exhibiting a brick-red to deep terracotta color. The specimen shown is a tumbled stone with a smooth surface, vitreous to waxy luster, and subtle darker mottling or banding due to varying hematite concentrations.
Physical Characteristics
Color: Red; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58–2.91; Fluorescence: Typically inert/none; Tenacity: Brittle but very tough due to aggregate structure.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: None (opaque); Pleochroism: None; Optical Character: Aggregate (usually behaves as isotropic due to opacity).
Hardness & Durability
Origin Region
Found worldwide; notable sources include India, Brazil, South Africa, USA (Oregon, Idaho), and Australia
Hardness & Durability
Mohs Hardness: 6.5–7; High durability and toughness; suitable for all jewelry types and daily wear.
Care & Maintenance
Clean with warm soapy water and a soft brush. Resistant to most chemicals and sunlight, but avoid harsh acids like hydrofluoric acid. Safe for ultrasonic cleaners.
Rarity & Value
Common; very affordable. Value is determined by color intensity and the absence of distracting fractures. Unenhanced; rarely treated.
Special Characteristics
Opaque nature distinguishes it from carnelian; the red color is specifically caused by high concentrations of dispersed hematite particles within the silica matrix.
Lore & History
Historically known as the 'Stone of Endurance' and used by Ancient Egyptians in amulets to provide protection. In traditional lore, it is associated with the Root Chakra and believed to promote grounding, stability, and physical strength.