Red Jasper
Quartz (microcrystalline) var. Jasper · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal crystal system; occurs in massive or microcrystalline aggregates (cryptocrystalline)
Mineral Group
Silicates (Tectosilicates); member of the Chalcedony/Quartz group
Chemical Formula
SiO2 (Silicon Dioxide) with Fe2O3 (Iron Oxide) inclusions
Formation Process
Sedimentary or Hydrothermal process where silica-rich fluids permeate porous rocks or volcanic ash, slowly precipitating and incorporating iron oxide impurities
About This Crystal
Opaque, earthy red to brownish-red color with occasional darker mottling or veins. It has a smooth, waxy to vitreous luster when polished and a fine-grained, dense texture.
Physical Characteristics
Color: Terracotta red; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58-2.91; Tenacity: Brittle; Fluorescence: Generally none.
Optical Properties
Refractive Index: Approx. 1.54; Birefringence: None (aggregate); Pleochroism: None; Transparency: Opaque; Optical Phenomenon: Generally none.
Hardness & Durability
Origin Region
Notable sources include Brazil, India, USA, Madagascar, and Russia; typically found in sedimentary or volcanic environments
Hardness & Durability
Mohs Hardness: 6.5 to 7; Toughness: Excellent due to its microcrystalline structure; high durability for jewelry and carvings.
Care & Maintenance
Clean with warm soapy water and a soft cloth; safe for most ultrasonic cleaners. Avoid harsh chemicals and protect from impact to prevent chipping.
Rarity & Value
Common and widely available; value is determined by color intensity and pattern. It is an affordable gemstone often used for beads and carvings.
Special Characteristics
Contains up to 20% foreign materials (inclusions) which create its characteristic opacity and varied earthy patterns; often contains hematite inclusions.
Lore & History
Historically known as a 'stone of endurance' and used since antiquity in amulets and seals. In modern metaphysical practices, it is associated with the Root Chakra, grounding, and physical strength.