Yellow Jasper
Quartz var. Jasper · Decorative Stone and Semi-Precious Gemstone
Crystal System
Trigonal, microcrystalline massive habit
Mineral Group
Silicates, Tectosilicates
Chemical Formula
SiO2
Formation Process
Sedimentary or hydrothermal deposition, formed from silica-rich fluids replacing organic or inorganic materials with microcrystalline quartz grains
About This Crystal
A polished, tear-drop shaped tumbled stone exhibiting a vibrant mustard to brownish-yellow color with intricate lighter cream-colored veining and brecciated fracture patterns, showing an opaque transparency and a smooth, vitreous to waxy polished luster
Physical Characteristics
Yellow to brown body color, white streak, microcrystalline aggregate form, no true cleavage, conchoidal to uneven fracture, specific gravity of approximately 2.65, brittle tenacity, and typically inert under UV light
Optical Properties
Singly refractive aggregate, uniaxial positive under microscopic examination, exhibits no pleochroism due to microcrystalline structure
Hardness & Durability
Origin Region
Found globally including India, Madagascar, Australia, Brazil, and the USA; forms in sedimentary environments and volcanic regions
Hardness & Durability
Mohs hardness of 6.5 to 7, good toughness due to interlocking microcrystalline structure, stable against light and normal household chemicals, highly durable for jewelry wear
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid harsh chemical cleaners, store away from harder gemstones to prevent scratching, highly stable in sunlight
Rarity & Value
Common and widely available, value depends primarily on the quality of the polish, interesting patterns, and size, typically very affordable in tumbled forms
Special Characteristics
Distinctive brecciated or patterned veining providing an aesthetic mosaic appearance, smooth tactile feel from tumbling
Lore & History
Historically used as an amulet of protection and grounding by ancient civilizations, associated in modern crystal healing with the solar plexus chakra, vitality, and emotional stability, though these are traditional beliefs rather than scientific claims