Jasper (Multi-color variety)
Silicon Dioxide (Microcrystalline Quartz) var. Jasper · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal; typically occurs in massive, microcrystalline aggregate forms without visible crystals.
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2 (Trace elements such as Fe2O3, FeO, or MnO2 provide color)
Formation Process
Primarily sedimentary or hydrothermal, formed when silica precipitates in volcanic ash or sedimentary deposits.
About This Crystal
An opaque, microcrystalline variety of quartz with a dull to vitreous luster. The specimen shows a variety of colors including brick red, olive green, pinkish-mauve, and black, likely due to iron oxides and other mineral inclusions.
Physical Characteristics
Color: Red, green, pink, black; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58–2.91; Fluorescence: Typically none.
Optical Properties
Refractive Index: ~1.54; Birefringence: None (aggregate); Pleochroism: None; Optical phenomena: Generally none, though some varieties show orbital patterns (not visible here).
Hardness & Durability
Origin Region
Globally distributed; variety like this is common in India, Brazil, Madagascar, and the USA (Oregon/Idaho).
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: Excellent due to its dense, microcrystalline structure; high durability for jewelry.
Care & Maintenance
Highly stable. Clean with warm soapy water and a soft brush. Avoid harsh chemicals and ultrasonic cleaners if the stone has surface-reaching fractures/fillers.
Rarity & Value
Common; Value is generally low but increases for specimens with unique orbicular patterns or vivid scenic landscapes.
Special Characteristics
Known for its 'brecciated' or 'mottled' appearance where different mineral phases have mixed, creating a multi-colored tapestry effect.
Lore & History
Historically known as the 'Supreme Nurturer' in ancient lore; used for protective amulets by Egyptians and Native American tribes. Traditionally associated with grounding and stability.