Jasper
Quartz var. Jasper · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Hexagonal; typically microcrystalline/massive habit with no visible crystal faces
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Silicon Dioxide) with Fe2O3 (Iron Oxide) impurities
Formation Process
Sedimentary or Hydrothermal; forms when silica-rich fluids permeate porous rock or volcanic ash, precipitating microcrystalline quartz.
About This Crystal
Opaque, microcrystalline variety of quartz. This specimen shows a dark, brownish-black base with distinct orange-red or yellow-ochre veins and inclusions. It has a smooth, waxy to vitreous luster when polished or wet.
Physical Characteristics
Color: Dark brown/black with orange veins; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58–2.91; Fluorescence: Usually inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: Weak (not visible in opaque specimens); Pleochroism: None; Optical character: Uniaxial (+).
Hardness & Durability
Origin Region
Found globally; notable sources include USA, India, Russia, Brazil, and Australia. Common in riverbeds and coastal areas.
Hardness & Durability
Mohs Hardness: 6.5–7; Excellent toughness due to microcrystalline structure; stable and very durable for jewelry.
Care & Maintenance
Safe to clean with warm soapy water and soft brushes. Generally resistant to household chemicals but should be stored away from harder gemstones like Topaz or Diamonds.
Rarity & Value
Common; value is determined by pattern uniqueness and polish quality. Generally inexpensive (\$1-\$5 per carat for polished stones).
Special Characteristics
Features distinct color-banding and 'picture' inclusions caused by iron oxide staining within the silica matrix.
Lore & History
Historically used for seals and amulets in ancient Mesopotamia and Egypt. Traditionally known as the 'Supreme Nurturer' in metaphysical lore, believed to provide grounding and protection.