Lapis Lazuli (Low-grade)
Lazurite-bearing rock · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Cubic (Isometric) for Lazurite, but the specimen is massive/granular
Mineral Group
Silicates (Tectosilicates, Sodalite group)
Chemical Formula
(Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2 (Lazurite component)
Formation Process
Metamorphic (Contact metamorphism of limestone or marble)
About This Crystal
A dark, opaque rock specimen with a matte to dull luster. Small patches of deep blue are visible, interspersed with significant grey to brownish-grey matrix (likely calcite or diopside).
Physical Characteristics
Blue body color with grey/brown matrix, white streak, no distinct cleavage (uneven fracture), specific gravity 2.4-2.9, non-magnetic, may show orange fluorescence under LWUV if calcite is present.
Optical Properties
Opaque; refractive index approximately 1.50 (aggregate); no pleochroism due to opacity; no fire or star effects visible.
Hardness & Durability
Origin Region
Badakhshan Province, Afghanistan; also found in Russia, Chile, and Myanmar
Hardness & Durability
Mohs hardness 5 to 5.5. Brittle tenacity. Fair durability but susceptible to scratches and acid.
Care & Maintenance
Avoid acidic cleaners and ultrasonic devices. Clean with warm soapy water and a soft cloth. Store away from harder gems like quartz or sapphire.
Rarity & Value
Common (low-grade). Value is determined by the intensity of the blue color and lack of white/grey inclusions. This specimen has high matrix content, lowering its commercial value.
Special Characteristics
Often contains gold-colored specks of pyrite, though not clearly visible in this specific lighting. Significant presence of host-rock matrix.
Lore & History
Used since the 7th millennium BCE in the Indus Valley and Ancient Egypt. Historically associated with royalty, wisdom, and the throat chakra in traditional lore.