Red Jasper
Microcrystalline Quartz (Jaspillite variety) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Hexagonal; typically occurs in massive, microcrystalline aggregates without visible crystal faces.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide) with Fe2O3 (Iron Oxide) inclusions
Formation Process
Forms primarily through hydrothermal processes or sedimentary precipitation where silica-rich fluids fill cavities and cracks, incorporating iron oxides.
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. This specimen appears as a rough, chunky mass with an uneven, slightly granular surface texture.
Physical Characteristics
Color: Brick red to brownish-red; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58–2.91; Fluorescence: Usually none; Tenacity: Brittle but very tough due to microcrystalline structure.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: None (aggregate); Pleochroism: None; Diaphaneity: Opaque even on thin edges; Dispersion: None.
Hardness & Durability
Origin Region
Widely distributed; major sources include South Africa, India, Brazil, Australia, and the United States (western states).
Hardness & Durability
Mohs Hardness: 6.5–7. It is highly durable and resistant to scratching, making it excellent for all types of jewelry and decorative carvings.
Care & Maintenance
Wash with warm soapy water and a soft cloth; safe for ultrasonic cleaning. Avoid prolonged exposure to harsh chemicals. Sunlight-stable.
Rarity & Value
Common and abundant. Value is determined by color intensity and the presence of interesting patterns. Generally very affordable as rough specimens or tumbled stones.
Special Characteristics
The red pigmentation is caused specifically by inclusions of hematite (iron oxide). It lacks the transparency or translucency found in other chalcedony varieties like carnelian.
Lore & History
Historically known as the 'stone of endurance.' Used by ancient Egyptians in amulets and by Native Americans as a sacred stone of rebirth. In modern lore, it is associated with the Root Chakra and grounding energy.