Yellow Jasper
Quartz var. Jasper · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal (Hexagonal - Microcrystalline/Cryptocrystalline); habit is typically massive and microgranular.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Silicon Dioxide) with impurities of iron oxides and hydroxides (Goethite)
Formation Process
Primarily sedimentary through the consolidation of microcrystalline silica, often forming in association with volcanic activity or hydrothermal vein deposits where mineral-rich fluids permeate porous rock.
About This Crystal
An opaque, microcrystalline variety of quartz. It features a deep ochre to mustard yellow body color with white or creamy inclusions and swirls. It has a dull to waxy luster and a smooth, dense surface texture.
Physical Characteristics
Color: Mustard yellow to golden brown; Streak: White; Cleavage: None; Fracture: Conchoidal to splintery; Specific Gravity: 2.58–2.91; Fluorescence: Usually none; Tenacity: Brittle.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: None (isotropic aggregate); Pleochroism: None; Transparency: Opaque.
Hardness & Durability
Origin Region
Found worldwide; notable sources include India, Australia, Brazil, and the USA (Oregon and Idaho). Forms in sedimentary or hydrothermal environments.
Hardness & Durability
Mohs Hardness: 6.5 to 7. It is very durable and tough due to its microcrystalline structure, making it excellent for all types of jewelry.
Care & Maintenance
Safe to clean with warm soapy water and a soft brush. Avoid harsh chemicals. It is generally stable under sunlight but should be stored separately to avoid scratching softer stones.
Rarity & Value
Common and affordable. Value is determined by the vibrancy of the yellow hue and the aesthetic patterns of interest created by inclusions.
Special Characteristics
Features characteristic 'fortification' or mottled patterns known as blooming or inclusions resulting from other mineral deposits like chalcedony or iron oxides.
Lore & History
Historically used by ancient civilizations as a stone of protection and discernment. In traditional lore, it is associated with the Solar Plexus chakra and believed to promote inner strength and mental clarity.