Red Jasper
Silicon Dioxide (var. Red Jasper) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal (Hidden within a microcrystalline/cryptocrystalline structure); massive habit
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 + Fe2O3 (Iron oxide impurities)
Formation Process
Sedimentary or Hydrothermal process where silica-rich fluids permeate porous rocks, enriched with iron oxides
About This Crystal
Opaque, deep terracotta-red rectangular tumbled stone with a dull to vitreous luster and dark linear veining
Physical Characteristics
Brick-red color, white streak, no cleavage, conchoidal to uneven fracture, SG 2.58-2.91, non-fluorescent
Optical Properties
Opaque; RI approximately 1.54; no birefringence or pleochroism visible due to opacity
Hardness & Durability
Origin Region
Brazil, South Africa, USA, and India; typically found in sedimentary and metamorphic environments
Hardness & Durability
Mohs hardness 6.5 to 7; high toughness and excellent durability for jewelry
Care & Maintenance
Clean with warm soapy water; safe for ultrasonic cleaning; resistant to fading and most chemicals
Rarity & Value
Common rarity; valued for color intensity and patterns; very affordable price range
Special Characteristics
Features dark hematite or magnetite veining (brecciated or banded appearance)
Lore & History
Historically known as the stone of endurance; used by Ancient Egyptians in amulets for protection and fertility