Jasper
Quartz var. Jasper (Microcrystalline Quartz) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal (Hexagonal); usually presents as massive or earthy, microcrystalline aggregates.
Mineral Group
Silicates (Tectosilicates); Quartz group
Chemical Formula
SiO2 (Silicon Dioxide) with impurities of Iron Oxides/Hydroxides (Limone/Goethite)
Formation Process
Forms via hydrothermal precipitation or through the replacement and silicification of original sediments or organic matter.
About This Crystal
An opaque, microcrystalline variety of quartz. This specific specimen displays a dull to earthy luster with a tan to brownish-grey color. It has a rough, granular surface texture with no visible individual crystals.
Physical Characteristics
Color: Tan/Brown; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58–2.91; Fluorescence: Generally inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: Low (0.009); Pleochroism: None; Optical Character: Doubly refractive, uniaxial positive (often too fine to measure).
Hardness & Durability
Origin Region
Globally abundant; notable sources include India, Russia, USA, Brazil, and Australia. Common in sedimentary and metamorphic environments.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: High (very durable due to fine-grained structure); Wearability: Excellent for all jewelry types.
Care & Maintenance
Clean with warm soapy water and a soft brush. Resistant to most household chemicals, but avoid hydrofluoric acid. Store separately from softer stones.
Rarity & Value
Common; value is determined by color patterns, landscape-like inclusions, or large sized carvings. Rough specimens have low monetary value.
Special Characteristics
Opaque nature distinguishes it from Chalcedony; color is driven by high concentrations of mineral inclusions (clay or iron oxides).
Lore & History
Historically used in antiquity for amulets and seals. Often called the 'Supreme Nurturer' in traditional lore; associated with grounding, stability, and protection across many cultures.