Jasper
Quartz var. Jasper (Microcrystalline Quartz) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Hexagonal; typically microcrystalline, massive, or cryptocrystalline habit
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2 (Silicon Dioxide) with Fe2O3 (Iron Oxide) inclusions
Formation Process
Sedimentary or Hydrothermal: often forms when silica-rich fluids permeate volcanic ash or sedimentary rocks, precipitating in cavities or replacing organic material
About This Crystal
An opaque, impure variety of silica characterized by its earthy, brownish-red to yellow-ochre color. It exhibits a dull to vitreous luster and a dense, fine-grained texture with notable color mottling.
Physical Characteristics
Color: Reddish-brown, yellow, and green patches; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58-2.91; Fluorescence: Typically inert.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009 (usually not measurable in massive form); Opacity: Opaque; Luster: Waxy to Vitreous.
Hardness & Durability
Origin Region
Globally distributed; notable sources include India, Russia, Madagascar, and the USA (Oregon, Idaho)
Hardness & Durability
Mohs Hardness: 6.5-7; Toughness: Excellent due to its microcrystalline structure; Stability: High resistance to most chemicals except Hydrofluoric acid.
Care & Maintenance
Safe to clean with warm soapy water and soft brushes; avoid harsh chemicals. Exceptionally durable for everyday jewelry wear.
Rarity & Value
Common; value is determined by pattern complexity, color vibrancy, and polish quality rather than rarity of material.
Special Characteristics
Displays distinctive color zoning and swirling patterns caused by varied concentrations of iron oxides and hydroxides within the silica matrix.
Lore & History
Historically known as the 'Supreme Nurturer' in various cultures; utilized by ancient Egyptians and Babylonians for amulets. Traditionally associated with grounding and protection.