Jasper
Quartz var. Jasper · Decorative Stone and Mineral Specimen
Crystal System
Trigonal, massive microcrystalline habit
Mineral Group
Silicates, Tectosilicates
Chemical Formula
SiO2
Formation Process
Sedimentary or hydrothermal deposition, silica-rich fluids replacing host rock or precipitating in cavities
About This Crystal
Opaque, fine-grained microcrystalline quartz aggregate displaying earthy brownish-red tones with vibrant orange veins and a grayish weathered matrix
Physical Characteristics
Red, brown, orange, and gray body colors; white streak; conchoidal fracture; no cleavage; specific gravity around 2.65; opaque; dull to waxy luster
Optical Properties
Aggregated microcrystalline structure resulting in isotropic or aggregate polarization under crossed polars; doubly refractive microcrystals
Hardness & Durability
Origin Region
Worldwide, notable deposits in India, Madagascar, USA, Egypt, and Brazil
Hardness & Durability
Mohs hardness of 6.5 to 7; high toughness due to microcrystalline interlocking structure; highly durable and stable
Care & Maintenance
Clean with warm soapy water and a soft brush; store away from harder gemstones to prevent scratching; chemically resistant
Rarity & Value
Common; very affordable unless featuring rare pictorial patterns or exceptional polishing; generally untreated
Special Characteristics
Rich earthy color variations, microcrystalline structure, often shows complex natural banding, brecciation, or webbed patterns
Lore & History
Used by ancient civilizations for talismans, seals, and weaponry; historically associated with grounding, endurance, and stability in modern crystal lore