Red Jasper
Quartz var. Jasper (Red Variety) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Hexagonal; Cryptocrystalline (microscopic fibrous aggregate), typically found in massive habit.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite/Iron Oxide) inclusions
Formation Process
Primarily sedimentary through the deposition of silica-rich fluids (often in hydrothermal veins or as part of banded iron formations) where iron oxides are trapped during crystallization.
About This Crystal
An opaque, microcrystalline variety of quartz. It features a dull to earthy luster when rough, turning vitreous when polished. It exhibits a deep terracotta to brick-red color with a grainy, dense texture.
Physical Characteristics
Color: Brick red to brownish-red; Streak: White or red; Cleavage: None; Fracture: Conchoidal to splintery; Specific Gravity: 2.58–2.91; Fluorescence: Generally inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: Minimal; Pleochroism: None; Diaphaneity: Opaque; Optical Character: Uniaxial positive (though aggregate nature makes it difficult to measure).
Hardness & Durability
Origin Region
Globally distributed; notable sources include India, Brazil, South Africa, and the southwestern USA. Found in sedimentary environments and metamorphic rocks.
Hardness & Durability
Mohs Hardness: 6.5–7.0. Very tough and durable due to its cryptocrystalline structure, making it highly resistant to scratching and breakage.
Care & Maintenance
Safe to clean with warm soapy water and soft brushes. Resistant to most household chemicals, but should be kept away from hydrofluoric acid. Generally stable in sunlight.
Rarity & Value
Common and abundant worldwide. Value is determined by color intensity and interesting patterns; generally inexpensive and sold by weight as rough or lapidary material.
Special Characteristics
Opaque nature distinguishes it from other chalcedonies. It often contains 'landscape' or 'poppy' patterns if mixed with other minerals, though this specimen appears to be solid red jasper.
Lore & History
Historically used in antiquity for seals, amulets, and jewelry in Egypt and Mesopotamia. Traditionally known as a 'stone of endurance' and 'supreme nurturer,' often associated with the Root Chakra in lore.