Red Jasper
Silicon Dioxide (Microcrystalline Quartz) with Hematite inclusions · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal (Microcrystalline); usually occurs in massive, opaque forms without visible crystals.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 + Fe2O3 (Iron oxide inclusions)
Formation Process
Formed from silica-rich fluids in volcanic rocks or through sedimentary processes where silica is deposited with high concentrations of iron oxide.
About This Crystal
An opaque, microcrystalline variety of quartz. It presents a deep brick-red to terracotta color due to high iron content. The surface shows a vitreous to earthy luster and a smooth, polished finish as a spherical bead.
Physical Characteristics
Color: Deep red; Streak: White or brownish-red; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58–2.91; Fluorescence: Often inert/none.
Optical Properties
Refractive Index: Approx. 1.54; Birefringence: None (too aggregate); Opacity: Generally fully opaque; Pleochroism: None.
Hardness & Durability
Origin Region
Brazil, India, South Africa, Australia, and the USA. Found in hydrothermal veins and sedimentary deposits.
Hardness & Durability
Mohs hardness: 6.5 to 7. Highly durable and tough; suitable for all types of jewelry and everyday wear.
Care & Maintenance
Clean with warm soapy water and a soft brush. Keep away from harsh chemicals like hydrofluoric acid. Light-stable and physically robust.
Rarity & Value
Common. Value is determined by color intensity and pattern uniformity. Typically very affordable as beads or tumble stones.
Special Characteristics
Known for its 'masking' of light due to dense hematite inclusions. Occasinally shows banding or mottling if mixed with other chalcedony varieties.
Lore & History
Historically known as the 'Stone of Endurance' and used by ancient Egyptians in amulets. In lore, it is associated with the Root Chakra for grounding and physical vitality.