Red Jasper
Quartz var. Jasper · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Hexagonal; usually occurs in massive, microcrystalline habits without visible crystal faces.
Mineral Group
Silicates (Tectosilicate subgroup; Chalcedony variety)
Chemical Formula
SiO2 + Fe2O3 (Silicon Dioxide with Hematite inclusions)
Formation Process
Sedimentary/Hydrothermal; formed when silica-rich fluids permeate porous rocks or volcanic ash, with iron oxides precipitating to create the red color.
About This Crystal
An opaque, microcrystalline variety of quartz. It features a deep brick-red to brownish-red color with a dull to vitreous luster when polished. This specific tumbled specimen shows subtle lighter patterning or mottling due to varying iron concentrations.
Physical Characteristics
Color: Brick red; Streak: White to pale red; Cleavage: None; Fracture: Conchoidal to splintery; Specific Gravity: 2.58–2.91; Fluorescence: Typically inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: None (aggregate); Pleochroism: None; Optical Character: Opaque.
Hardness & Durability
Origin Region
Brazil, India, South Africa, Australia, and USA (notably Oregon and Idaho); found in sedimentary and volcanic environments.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: Excellent (very durable due to microcrystalline structure); Stability: Highly stable against light and most chemicals.
Care & Maintenance
Clean with warm soapy water. Safe for ultrasonic cleaners. Highly durable for jewelry, though avoid harsh acids like hydrofluoric acid.
Rarity & Value
Common; very affordable. Value is determined by color intensity and interesting patterns. Rarely treated, though occasionally dyed if the natural color is dull.
Special Characteristics
Opaque nature distinguishes it from carnelian; the red color is specifically attributed to high concentrations of iron (hematite) inclusions.
Lore & History
Historically used in ancient Egypt for amulets and in Medieval Europe as a 'warrior's stone' for protection. In metaphysical traditions, it is associated with the Root Chakra and believed to provide grounding, endurance, and physical strength.