Polychrome Jasper (Desert Jasper)
Quartz (Microcrystalline) var. Jasper · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal crystal system; occurs in microcrystalline/massive habit with no visible crystal faces
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2 (Silicon Dioxide) with impurities of Iron oxides/hydroxides (Hematite, Goethite) and Clay minerals
Formation Process
Sedimentary/Hydrothermal; formed as silica-rich fluids circulated through volcanic ash or sedimentary beds, precipitating microcrystalline quartz and trapping minerals
About This Crystal
An opaque, microcrystalline variety of quartz featuring circular, wavy, or band-like patterns. This specimen displays a gradient of earthy tones including chocolate brown, tan, and sandy beige with a waxy to vitreous luster upon polishing.
Physical Characteristics
Color: Multicolored (brown, tan, cream); Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58–2.91; Fluorescence: Generally inert under UV light
Optical Properties
Refractive Index: Approx. 1.54; Birefringence: None (aggregate); Pleochroism: None; Optical Character: Aggregate (Singly Refractive behavior)
Hardness & Durability
Origin Region
Primarily Madagascar (specifically the Norcross-Madagascar fields); found in sedimentary and volcanic deposits
Hardness & Durability
Mohs Hardness: 6.5 to 7; Toughness: Excellent (very durable due to interlocking grain structure); Stability: Highly stable against light and chemicals
Care & Maintenance
Clean with warm soapy water and a soft brush; safe for ultrasonic cleaning but unnecessary. Store away from harder stones like Sapphire or Diamond to prevent scratching.
Rarity & Value
Common; Value is determined by the complexity of the color patterns and the quality of the polish. Generally an affordable collector stone or lapidary material.
Special Characteristics
Displays 'orbicular' or 'flame' patterns created by rhythmic precipitation of iron and other impurities during formation; lacks inclusions visible to the naked eye due to opacity.
Lore & History
Discovered relatively recently (2006) in Madagascar. In metaphysical traditions, it is associated with the Root chakra, believed to provide grounding, stability, and a connection to the Earth's 'fire' energy.