Lazulite

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Physical & Optical Properties

Mohs Hardness 5.5
Specific Gravity 3.04 – 3.17
Refractive Index 1.604 – 1.646
Crystal System Monoclinic
Luster Vitreous
Cleavage Indistinct
Fracture Uneven,Splintery
Color various
Birefringence 0.031
Dispersion 0.014
Pleochroism Transparent crystals show a strong pleochroism: colorless - light blue - dark (violet) blue

Mohs Hardness

Mohs Hardness: 5.5
1 Soft10 Hard

Crystal System

β a b c Monoclinic a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

About Lazulite

Lazulite is a magnesium iron aluminum phosphate mineral occurring in vivid sky-blue to deep blue crystals with a vitreous luster, named from an Arabic-Latin word for blue sky. It forms in quartzite, pegmatites, and quartz veins under metamorphic conditions and is found in localities in Salzburg, Austria; Yukon, Canada; Brazil; Sweden; and Madagascar. Transparent faceted lazulite is uncommon and cherished by phosphate mineral and blue gemstone collectors for its intense blue color.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Lazulite?
Lazulite is a magnesium iron aluminum phosphate mineral occurring in vivid sky-blue to deep blue crystals with a vitreous luster, named from an Arabic-Latin word for blue sky. It forms in quartzite, pegmatites, and quartz veins under metamorphic conditions and is found in localities in Salzburg, Aus
What is the hardness of Lazulite?
Lazulite has a Mohs hardness of 5.5, making it moderate for use in jewelry.
What color is Lazulite?
Lazulite is primarily Various.
How much does Lazulite cost?
Lazulite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Lazulite?
Lazulite belongs to the Monoclinic crystal system.

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