Red Jasper
Quartz var. Jasper (Microcrystalline Quartz) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal (Crystalline) / Monoclinic/Orthorhombic (Cryptocrystalline); Habit is typically massive, granular, or chunky without visible external crystal faces.
Mineral Group
Silicates; Subgroup: Tectosilicates
Chemical Formula
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite) inclusions typically between 5% and 20%
Formation Process
Primarily Sedimentary or Hydrothermal; forms when silica-rich fluids circulate through volcanic ash or sediment, or via the metamorphism of iron-rich sediments under moderate heat and pressure.
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 for raw specimens, often polished to a high vitreous sheen. It may contain veins of black (hematite) or white (quartz).
Physical Characteristics
Color: Brick red to brownish-red; Streak: White; Cleavage: None; Fracture: Conchoidal to splintery or uneven; Specific Gravity: 2.58–2.91; Fluorescence: Generally none.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: None (aggregate of crystals); Singly refractive (isotropic) properties in thin section; Pleochroism: None; Opaque.
Hardness & Durability
Origin Region
Found globally; notable sources include Brazil, South Africa, Australia, India, and the southwestern United States. Often found in Banded Iron Formations.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: Excellent (no cleavage makes it very sturdy); Stability: High (resistant to most acids and heat).
Care & Maintenance
Safe to clean with warm soapy water or ultrasonic cleaners. Store separately to avoid scratching softer stones. Not sensitive to sunlight and does not fade.
Rarity & Value
Common; Very affordable. Value is determined by color intensity and interesting patterns. Often sold as rough specimens, cabochons, or tumbled stones.
Special Characteristics
Rich red pigment is entirely due to high iron oxide (hematite) content. Some varieties show 'brecciated' patterns where the stone has broken and re-fused with different minerals.
Lore & History
Historically known as the 'Stone of Endurance' and used in ancient Egypt for amulets and scarabs. Symbolically associated with the Root Chakra and vitality. Historically used by warriors for protection and grounding.