Red Jasper
Quartz (Microcrystalline) var. Red Jasper · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal (Hexagonal); usually found in massive, microcrystalline aggregates without visible crystal faces.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide) primarily with Fe2O3 (Hematite) inclusions
Formation Process
Primarily sedimentary or hydrothermal; forms when silica-rich fluids permeate porous rocks or volcanic ash, crystallizing into microcrystalline quartz.
About This Crystal
An opaque, microcrystalline variety of quartz. It features a deep brick-red to terracotta color with a smooth, vitreous to waxy luster when polished. It often contains dark streaks or patches due to varied iron oxide concentrations.
Physical Characteristics
Color: Deep red; Streak: White or light red; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58–2.91; Fluorescence: Typically inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009 (usually not measurable in opaque masses); Optical Phenomema: None typically present in Jasper.
Hardness & Durability
Origin Region
Found globally; major deposits in South Africa, Brazil, India, Madagascar, and the USA (Southwest).
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: High due to interlocking microcrystalline structure; Stable against most heat and chemicals.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh acids. Safe for ultrasonic cleaning, but physical impact should be avoided to prevent chipping.
Rarity & Value
Common; very affordable. Value is determined by color intensity and the presence of interesting patterns or inclusions.
Special Characteristics
Opaque transparency distinguishes it from other chalcedonies; pigmentation is caused by high iron (hematite) content within the silica matrix.
Lore & History
Historically known as a stone of endurance and protection. Used in antiquity for seals and amulets in Egypt and Rome. Traditionally associated with the Root Chakra and groundedness.