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This mineral species can be opaque to crystalline transparent. The color of lazulite ranges from medium to dark greenish blue to violet blue and is often mottled with white. When fashioned into gems, finished stones typically weigh less than 5 carats. A separate mineral species, lazulite should not be confused with lazurite or azurite.

Lazulite Polished
Lazulite Classification
Common Name Lazulite
Species Lazulite
Lazulite Optical Properties
Transparency Transparent - Opaque
Dispersion Strength: None
Refractive Index 1.612-1.643
Birefringence 0.031
Optic Character Biaxial
Optic Sign Negative
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: inert
LWUV: inert
Pleochroism Trichroic, strong dark violetish blue, colorless, and light blue
Lazulite Characteristic Physical Properties
Hardness 5-6
Streak White
Specific Gravity 3.080-3.170 Typical:3.090
Toughness Poor
Inclusions Transparent material is highly included. Aggregate lazulite material will have a mottled appearance with white areas.
Luster Vitreous
Fracture Granular, Uneven
Cleavage Good, in one direction, Poor, in one direction
Lazulite Chemistry & Crystallography
Chemical Name basic magnesium aluminum phosphate
Chemical Formula MgAl2(PO4)2(OH)2
Crystal System Monoclinic
Chemistry Classification Phosphate

Lazulite Colors

  • Brown Lazulite Brown
  • Blue Lazulite Blue
  • Green Lazulite Green
  • Black Lazulite Black

Alternate Names


Countries of Origin

Afghanistan; Pakistan; United States of America (the); Brazil

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.