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Lazulite
Current inventory:  1 gem
 

Lazulite

Chemistry:  (Mg,Fe)Al2(PO4)2(OH)2

Discovered in 1795;   IMA status: Valid (pre-IMA; Grandfathered).
I have found two possibilities for the naming of Lazulite. The first, the name is from the German word lazurstein, meaning blue stone. The second, the name is from the Arabic word azul, meaning sky or heaven, and the Greek word lithos, meaning stone.

 

Classification

   

   

Mineral Classification:

Phosphates

Strunz 8th Ed. ID:

7/B.08-20

 

7 : Phosphates, Arsenates, Vanadates
B : Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of very small size: Li, Be
08 : Lazulite group, Trolleite - Richellite

 

 

Crystal Data

   

   

Crystallography:

Monoclinic - Prismatic

Crystal Habit:

As crystals, stubby to acute dipyramidal, to 15 cm, or tabular, with several other forms noted; granular, massive.

 

 

Physical Properties

   

 

Cleavage:

[110] Poor to Good; [101] Indistinct

Fracture:

Uneven to Splintery

Tenacity:

Brittle

Moh's Hardness:

5.0 - 6.0

Density:

3.122 - 3.240 (g/cm3)

Radioactivity:

Not Radioactive

 

 

Optical Properties

   

   

Color:

Azure-blue, sky-blue, bluish white, yellow-green, blue-green, rarely green

Transparency:

Transparent to Translucent, Opaque

Luster:

Vitreous

Refractive Index:

1.604 - 1.677  Biaxial ( - )

Birefringence:

0.038 - 0.040

Dispersion:

Weak

Pleochroism:

Strong; X = colorless; Y = blue; Z = darker blue

 

 

Occurances

   

   

Geological Setting:

Disseminated in metamorphic quartzites, schists and quartz veins; in the border zones of complex granite pegmatites; in alluvium and colluvium.

Type Locality:

Fre▀nitzgraben, Krieglach, Fischbacher Alpen Mts, Styria, Austria

Year Discovered:

1795

View mineral photos:

Lazulite Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org
Webmineral.com

 

 


Lazulite is a rare gem because most material is opaque and suitable only for cabochons. Transparent rough material suitable for faceted gems is very rare and crystals are quite small and usually heavily included. Lazulite gems from Brazil are small, but a beautiful vivid blue while gems from Pakistan are larger and may be a deep bluish green. Both make for beautiful gems. Lazulite is too soft for jewelry but adds nice color to any gem collection.
 

  
Lazulite gems for sale:

Lazulite-001

Gem:

Lazulite

Stock #:

LAZUL-001

Weight:

0.054 ct

Size:

2.81 x 2.81 x 1.16 mm

Shape:

Trillion

Color:

Blue

Clarity:

SI

Origin:

Brazil

Treatment:

None (natural)

Price:

SOLD (but we have others)

Pictures are of the actual gem offered for sale.
Gem images are magnified to show detail.

Lazulite-001

Lazulite is one of the most magnificent of the blue gems. This one is no exception. The color is a vivid blue.


 

I love Sarah