Red Jasper
Silicon Dioxide (Microcrystalline/Crypto-crystalline Quartz) with Hematite inclusions · Semi-Precious Gemstone / Decorative Stone.
Crystal System
Trigonal crystal system; generally occurs in a massive, microcrystalline habit without visible external crystal faces.
Mineral Group
Silicates; Tectosilicate subgroup (Quartz group).
Chemical Formula
SiO2 + Fe2O3
Formation Process
Sedimentary or hydrothermal; it forms when silica-rich fluids permeate volcanic or sedimentary rocks, often accumulating in veins or nodules as iron oxides precipitate concurrently.
About This Crystal
An opaque, microcrystalline variety of quartz. This specimen shows a deep brick-red to brownish body color with light pinkish-white mottling or banding. It has a smooth, tumbled finish with a dull to vitreous luster upon polishing.
Physical Characteristics
Color: Brick-red to terracotta; Streak: White; Cleavage: None; Fracture: Conchoidal to splintery; Specific Gravity: 2.58–2.91; Fluorescence: Typically inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: Weak or none (aggregate); Pleochroism: None; Optical character: Opaque; Dispersion: None.
Hardness & Durability
Origin Region
Globally abundant; major sources include South Africa, Brazil, India, Madagascar, and the USA (southwest). Found in sedimentary or metamorphic environments.
Hardness & Durability
Mohs Hardness: 6.5–7; highly durable and resistant to scratching. Excellent toughness due to its microcrystalline structure which lacks cleavage planes.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals and ultrasonic cleaners if the stone has surface-reaching fractures. Generally safe in sunlight.
Rarity & Value
Common; value is determined by the vibrancy of the red color and the uniqueness of the patterns. It is very affordable and rarely subject to artificial treatments.
Special Characteristics
The red color is caused by high concentrations of iron oxide (hematite) inclusions. It may exhibit 'orbicular' patterns or brecciated structures in other varieties.
Lore & History
Historically known as a 'stone of endurance' and used in ancient Egypt for amulets. It is traditionally associated with the Root Chakra and believed to provide grounding and physical strength.
Notes
Deep brick-red to brown and light pink