Lazulite



Lazulite, Mancorra, ( Portugal)

Composition Fosfato de aluminio y magnesio (Mg,Fe)Al2( Po4)2(OH)2 Crystal system monoclinic
Hardness (Moh´s)
 5-6 Density 3,04- 3,30
Refractive index 1,612- 1,646 Birefringence -0,031 a -0,036
Pleocroisme
 hard: colorless, dark blue Fluorescence yes
Fracture
 irregular I. Dispertion ?
Cleavage
 imperfect Streak white
Absortion: not determinated.

 

  • The name comes from the blue colour that has the Lazulite. In arabic Azraqun = blue and in greek lithos =stone. It´s clear blue, dark blue and blue-green. Rarely it´s found in crystals. Normaly are aggregates massives and granulars.
  • Localities: Rare. In Península Ibérica in gem quality we just know the variety that cames from Mancorra (Portugal) that has a clear matrix with blue globules.
  • Confusions: With other blue stones: azurite, lapis lazuli, sodalite.
  • Treatments: Unknown.
  • Gemologicals uses: In cab, beads.
 
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© Montse Bagué and Josep M. Serrano.Text and photos. Reproduction not allowed without permission.