Red Jasper
Quartz (Microcrystalline) var. Jasper · Semi-Precious Gemstone; Decorative Stone
Crystal System
Trigonal/Hexagonal; microcrystalline (cryptocrystalline) aggregate, massive habit
Mineral Group
Silicates; Tectosilicate
Chemical Formula
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite) inclusions
Formation Process
Sedimentary or Hydrothermal; forms through the deposition of silica-rich fluids in volcanic ash or sedimentary layers. The red color is typically the result of iron oxidation (hematite) during stone formation.
About This Crystal
An opaque, microcrystalline variety of quartz. It features a deep reddish-brown to brick-red color with a dull to vitreous luster. The sample shown displays a grainy, matte texture typical of unpolished raw jasper, with subtle veining of lighter quartz or minerals.
Physical Characteristics
Color: Deep red to brownish-red; Streak: White; Cleavage: None; Fracture: Conchoidal is typical, though can appear uneven in massive forms; Specific Gravity: 2.6 – 2.9; Diaphaneity: Opaque.
Optical Properties
Refractive Index: 1.544 – 1.553; Birefringence: None (aggregate); Pleochroism: None; Optical Character: Singly refractive aggregate; Dispersion: None.
Hardness & Durability
Origin Region
Found worldwide; notable sources include India, Brazil, South Africa, and the southwestern United States (Arizona, Utah). Common in sedimentary environments and metamorphic blocks.
Hardness & Durability
Mohs Hardness: 6.5 – 7.0; Toughness: Very high due to interlocking microcrystalline structure; Stability: High; highly resistant to chemicals and weathering.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals or ultrasonic cleaners if the stone has surface-reaching fractures. Stable under sunlight and heat.
Rarity & Value
Common; widely available and affordable. Value is determined by color intensity, pattern, and the quality of the lapidary work in polished pieces.
Special Characteristics
The red color is specifically due to fine inclusions of hematite. Some specimens may show 'orbicular' patterns or distinct quartz veins. Non-fluorescent.
Lore & History
Jasper has been used as an ornamental stone for millennia. Ancient Egyptians used it in amulets for protection, and it is mentioned in Biblical texts. Metaphysically, it is known as the 'Supreme Nurturer' and is associated with the Root Chakra, believed to provide grounding and endurance.