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 and hydrothermal deposition, where silica-rich fluids permeate porous rocks or sediments, precipitating microcrystalline quartz with various mineral impurities.
About This Crystal
Small, tumbled, opaque brownish-red stone with a smooth polished surface and a waxy to vitreous luster, showing subtle variations in tone.
Physical Characteristics
Color ranges from brown to reddish-brown; streak is white; cleavage is absent; fracture is conchoidal; specific gravity is approximately 2.65; brittle tenacity.
Optical Properties
Singly refractive aggregate, generally anisotropic under crossed polars with microcrystalline birefringence; pleochroism absent.
Hardness & Durability
Origin Region
Found globally; major deposits in India, Madagascar, Australia, Brazil, and the USA. Forms in sedimentary and volcanic environments.
Hardness & Durability
Mohs hardness of 6.5 to 7; good toughness and durability; excellent wearability for jewelry use with no cleavage concerns.
Care & Maintenance
Safe to clean with warm soapy water; avoid harsh acids or prolonged exposure to extreme heat; store separately from softer materials.
Rarity & Value
Very common worldwide; inexpensive and widely accessible, with value depending on color patterns, size, and polish quality.
Special Characteristics
Opaque nature due to high concentrations of iron oxide and other mineral impurities distributed uniformly throughout the microcrystalline matrix.
Lore & History
Historically used by ancient civilizations for talismans, seals, and weaponry. Often associated in modern crystal healing with grounding, stability, and endurance.