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Mineralpedia Details for Lazurite

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Lazurite

Lazurite

Named after the Persian word lazhward, meaning “blue,” and in reference to its similarity to azurite. The formation of lazurite is a result of contact metamorphism of limestones and can be found in Afghanistan, Russia, Tajikistan, Italy, the United States, Canada, Burma, and Chile, among some others.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/lazurite.pdf

Formula
Na3Ca(Si3Al3)O12
Crystal System
Isometric 
Crystal Habit
Massive - Granular 
Cleavage
Imperfect, None, None 
Luster
Vitreous - Dull 
Color
blue, azure blue, violet blue, greenish blue 
Streak
light blue 
Class
Isometric - Hextetrahedral 
Fracture
Conchoidal 
Hardness
5.5 
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Lazurite from Lajuar Madan, Sar-e-Sang dist., Badakhshan, Afghanistan

Lazurite
            from Lajuar Madan, Sar-e-Sang dist., Badakhshan, Afghanistan

A very splendid and showy matrix specimen with two large deep blue Lazurite crystals to 2cm perched nicely atop the Muscovite matrix. There are several smaller Lazurite crystals at the base.

Gorgeous, rich lapis lazuli blue crystal to 3cm across with mulitple faces exposed from white marble matrix.

Deep blue crystals to 4cm and 2cm with a few others in matrix of calcite and Fosterite crystals to 1.5cm.

Click thumbnail images for larger view.

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