Red Jasper
Silicon Dioxide var. Jasper (Red) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal (Microcrystalline/Cryptocrystalline); habit is massive, occurring in large opaque beds or nodules.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 with Fe2O3 (Iron Oxide/Hematite inclusions)
Formation Process
Sedimentary or Hydrothermal; forms when silica-rich fluids permeate through volcanic ash or sediment, carrying iron oxides that give the stone its red color.
About This Crystal
An opaque, microcrystalline variety of quartz showing a deep brick-red to terracotta color. This specimen is polished into a sphere, exhibiting a waxy to vitreous luster, with visible white/tan quartz veining and dark dendritic or spotted inclusions.
Physical Characteristics
Color: Red; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58–2.91; Tenacity: Brittle; Fluorescence: Generally inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009 (usually not measurable in opaque jasper); Pleochroism: None; Diaphaneity: Opaque.
Hardness & Durability
Origin Region
Brazil, South Africa, India, Australia, and USA; typically formed in hydrothermal veins or sedimentary environments.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: High due to microcrystalline structure; Stability: Excellent against light and most chemicals; suitable for daily jewelry wear.
Care & Maintenance
Safe to clean with warm soapy water and a soft brush; avoid harsh ultrasonic cleaners if fractures or veins are deep; store separately from softer minerals like calcite.
Rarity & Value
Common; Value is generally low but increases with color saturation and unique veining; heat treatment is rare as the color is naturally derived from iron.
Special Characteristics
Presents visible secondary mineral veining (likely quartz or calcite) and dark hematite spots; lacks the transparency or optical phenomena of other quartz varieties.
Lore & History
Historically known as a stone of endurance and protection, used in ancient Egypt for amulets and in Viking lore for hilt-inlays. In modern practices, it is associated with the Root Chakra and groundedness.