Red Jasper
Microcrystalline Quartz var. Jasper · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal; typically occurs in massive, microcrystalline (cryptocrystalline) habits with no visible individual crystals.
Mineral Group
Silicates (Tectosilicate subgroup; Quartz group)
Chemical Formula
SiO2 with Fe2O3 (Iron Oxide/Hematite) inclusions
Formation Process
Sedimentary or Hydrothermal; forms when silica-rich fluids permeate porous rocks or volcanic ash, precipitating microcrystalline quartz that incorporates mineral impurities like iron oxide.
About This Crystal
An opaque, earthy to dull red stone with a micro-granular structure. It often features secondary white or grey veins of pure chalcedony or quartz. The luster is vitreous to waxy when polished but dull when raw.
Physical Characteristics
Color: Terracotta to brick red. Streak: White. Cleavage: None. Fracture: Conchoidal to splintery. Specific Gravity: 2.58–2.91. Tenacity: Brittle but very tough due to aggregate structure. Magnetism: None. Fluorescence: Generally inert.
Optical Properties
Refractive Index: Approx. 1.54. Birefringence: None (aggregate). Pleochroism: None. Dispersion: None. Optical character: Aggregate; singly refractive effectively.
Hardness & Durability
Origin Region
Found globally; notable sources include India, Brazil, Madagascar, USA (Southwest), and South Africa. Typically found in sedimentary or metamorphic environments.
Hardness & Durability
Mohs Hardness: 6.5–7. Toughness: High (resistant to chipping). Stability: Highly stable; resistant to most household chemicals and light fading.
Care & Maintenance
Clean with warm soapy water and a soft brush. While durable, it should be stored away from harder stones like diamonds or sapphires to prevent scratching. Avoid harsh acid cleaners.
Rarity & Value
Common and abundant. Value is determined by patterns, color intensity, and polish quality. Raw specimens are very affordable, often sold by weight. Typically untreated.
Special Characteristics
Features distinct white quartz veining (brecciated appearance). Non-fluorescent. Opaque even in thin sections.
Lore & History
Historically known as the 'stone of endurance' and used in ancient Egypt for amulets and scarabs. Symbolically associated with the Root Chakra; traditionally believed to provide grounding, stability, and physical strength.