Red Jasper
Quartz var. Red Jasper (Cryptocrystalline Quartz) · Semi-Precious Gemstone / Decorative Stone / Mineral Specimen
Crystal System
Trigonal crystal system; occurring in massive, microcrystalline habits without visible crystal faces. Often found as rounded water-worn pebbles or tumbled stones.
Mineral Group
Silicates (Tectosilicate group); a variety of Chalcedony/Quartz.
Chemical Formula
SiO2 (Silicon Dioxide) with impurities of Fe2O3 (Hematite/Iron Oxide)
Formation Process
Primarily Sedimentary or Hydrothermal; forms when silica-rich fluids percolate through sediment or volcanic ash, replacing organic or mineral matter, or filling veins. The red color comes from high iron content incorporated during oxidation.
About This Crystal
An opaque, microcrystalline variety of quartz. This specific specimen appears as a smooth, river-worn or tumbled oblong pebble with a terracotta-red to brownish-orange hue. It exhibits a dull to waxy luster and a dense, uniform appearance with slight surface pitting.
Physical Characteristics
Color: Brick-red to brownish-red; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58–2.91; Tenacity: Brittle; Fluorescence: Generally inert under UV light.
Optical Properties
Opaque (no light passes through); Refractive Index: approximately 1.544–1.553; Birefringence: None (aggregate); Pleochroism: None; Luster: Vitreous to waxy when polished.
Hardness & Durability
Origin Region
Found worldwide; major sources include South Africa, Brazil, India, USA (Oregon, Idaho), Australia, and Madagascar.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: High (very durable due to microcrystalline structure); Stability: Very stable, resistant to heat and most chemicals.
Care & Maintenance
Clean with warm soapy water and a soft brush; safe for ultrasonic and steam cleaning. Hard enough to scratch many other stones, so store separately. Avoid prolonged exposure to harsh acids.
Rarity & Value
Common; very affordable. Value is determined by color intensity, pattern, and the quality of the polish. Larger specimens with unique patterns or 'landscape' features are more prized by collectors.
Special Characteristics
Opaque nature distinguishes it from other chalcedonies; may contain 'mountain' or ‘picture’ patterns in larger pieces though this specimen is relatively solid in color.
Lore & History
Historically known as the 'Stone of Endurance' and used by ancient Egyptians in amulets to enhance fertility and protection. Culturally associated with the Earth element and the Root Chakra in modern crystal healing, believed to provide grounding, stability, and physical strength.