Red Jasper
Quartz var. Jasper (Microcrystalline Quartz) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal (Hexagonal); typically occurs in a massive microcrystalline habit as aggregate grains.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite) impurities
Formation Process
Formed via sedimentary or hydrothermal processes where silica-rich fluids permeate porous rock or volcanic ash, incorporating iron oxide (Hematite) which provides the red pigment.
About This Crystal
The specimen is a polished, opaque, brick-red cabochon. It exhibits a dull to vitreous luster upon polishing, with a smooth surface and characteristic darker fine-line inclusions or slight mottling typical of jasper varieties.
Physical Characteristics
Color: Brick red to brownish-red; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58–2.91; Fluorescence: Typically inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: Low (0.009); Pleochroism: None; Optical Character: Opaque (Singly refractive aggregate).
Hardness & Durability
Origin Region
Brazil, South Africa, India, and USA. Found in hydrothermal veins, volcanic ash, and sedimentary environments.
Hardness & Durability
Mohs Hardness: 6.5–7. Excellent durability and toughness for jewelry due to its cryptocrystalline structure and lack of cleavage.
Care & Maintenance
Safe to clean with warm soapy water and soft brushes. Resistant to most household chemicals but should be stored away from harder stones like diamonds to prevent scratching.
Rarity & Value
Common; Value is generally low, determined by the intensity of the red color and the quality of the polish. Rarely treated, though some may be dyed or stabilized.
Special Characteristics
Opaque nature distinguishes it from other chalcedonies. May contain 'brecciated' patterns or dendrites in some specimens, though this example is relatively uniform.
Lore & History
Historically known as the 'Stone of Endurance' and used in ancient Egypt and by Native Americans for amulets. Metaphysically associated with the Root Chakra and grounding energy.