Red Jasper
Quartz (Microcrystalline) var. Jasper · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal crystal system; microcrystalline/cryptocrystalline habit (forming dense, massive aggregates)
Mineral Group
Silicates (Tectosilicate group)
Chemical Formula
SiO2 with Fe2O3 (Iron Oxide) inclusions
Formation Process
Sedimentary or Hydrothermal; typically forms when silica-rich fluids permeate porous rocks or volcanic ash, incorporating hematite (iron) during crystallization.
About This Crystal
An opaque, microcrystalline variety of quartz characterized by a deep brick-red to brownish-red color. The specimen exhibits a vitreous to waxy luster, smooth polished surface, and contains darker vein-like inclusions or lighter tan patches typical of brecciated or variegated jasper.
Physical Characteristics
Color: Terracotta red; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58–2.91; Tenacity: Brittle but very tough due to aggregate structure; Fluorescence: Generally inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: Weak or none (aggregate effect); Pleochroism: None; Transparency: Opaque; Optical Phenomenon: None.
Hardness & Durability
Origin Region
Found worldwide; notably South Africa, Brazil, India, USA, and Australia. Often occurs in hydrothermal veins or as sedimentary nodules.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: Excellent (very resistant to chipping); Stability: High (resistant to heat, light, and common household chemicals).
Care & Maintenance
Clean with warm soapy water and a soft cloth; safe for ultrasonic cleaners. Store separately to avoid scratching softer stones, though it is quite durable for daily jewelry wear.
Rarity & Value
Common; very affordable. Value is determined by patterns, color saturation, and the quality of the polish. Rarely treated, though occasionally dyed to enhance redness.
Special Characteristics
Can feature 'phantom' patterns or brecciation where the stone has been broken and healed with silica; colors are primarily due to high iron oxide content dispersed throughout the quartz.
Lore & History
Known historically as a 'warrior's stone' used in amulets for protection and courage. In ancient Egypt, it was associated with the blood of Isis. In modern belief systems, it is associated with the Root Chakra, grounding, and physical vitality.