Lazulite - (Mg,Fe2+)Al2(PO4)2(OH)2

Named in 1795 by Marten H. Klaproth from the term "Lazaward", which means heaven in Arabic, in allusion to its colour. Austria is the type locality of Lazulite, with the noteworthy localities of Fischbach, in Styria. In Italy, Lazulite comes from the Vizze pass, Bolzano Province; and from Monte Folgorito, Pietrasanta, Lucca Province.

Lazulite is in a solid solution series with the mineral scorzalite. The lazulite-scorzalite series ranges from the magnesium rich lazulite to the iron rich scorzalite. The rarer scorzalite does not differ appreciably, except that it tends to be darker, less transparent and denser than lazulite.

It forms by high grade metamorphism of high silica quartz rich rocks and in pegmatites. It occurs in association with quartz, andalusite, rutile, kyanite, corundum, muscovite, pyrophyllite and dumortierite, in metamorphic terrains; and with albite, quartz, muscovite, tourmaline and beryl in pegmatites.
It may be confused with lazurite (a blue feldspathoid and a member of the sodalite group) or azurite (deep blue copper carbonate).

Optical Properties:

Habits: Dipyramidal crystal. Also granular and massive.
Color: Azure-blue, sky-blue, bluish white, yellow-green, blue-green, rarely green.
Pleochroism: Strong, from colorless to blue and darker blue.
Birefringence: High, II-III order.

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Lazulite (Azure-blue), siderite (brown) and quartz (withe). Pegmatite from Palermo Mine, NH, USA



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Lazulite (Azure-blue), siderite (brown) and quartz (withe). Pegmatite from Palermo Mine, NH, USA





Bibliography



• Deer, W.A., Howie, R.A., Zussman, J. (1998) Rock-forming Minerals.
• Optical Mineralogy : The Nonopaque Minerals by Phillips / Griffen


Photo
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (high birefringence), siderite and quartz. Palermo mine pegmatite, New Hampshire (USA). XPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (high birefringence), siderite and quartz. Palermo mine pegmatite, New Hampshire (USA). XPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (high birefringence), siderite and quartz. Palermo mine pegmatite, New Hampshire (USA). XPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (high birefringence), siderite and quartz. Palermo mine pegmatite, New Hampshire (USA). XPL image, 1x (Field of view = 9mm)
lazulite(10).jpg

Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
lazulite(11).jpg

Lazulite (high birefringence), siderite and quartz. Palermo mine pegmatite, New Hampshire (USA). XPL image, 1x (Field of view = 9mm)
lazulite(12).jpg

Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (high birefringence), siderite and quartz. Palermo mine pegmatite, New Hampshire (USA). XPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
lazulite(21).jpg

Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Cristalli di lazulite (alti colori di interferenza), siderite e quarzo in una pegmatite della miniera di Palermo, New Hampshire (USA). Immagine a NX, 1x (lato lungo = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (high birefringence), siderite and quartz. Palermo mine pegmatite, New Hampshire (USA). XPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 1x (Field of view = 9mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 2x (Field of view = 7mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 2x (Field of view = 7mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 2x (Field of view = 7mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 2x (Field of view = 7mm)
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Lazulite (high birefringence), siderite and quartz. Palermo mine pegmatite, New Hampshire (USA). XPL image, 2x (Field of view = 7mm)
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Lazulite (Azure-blue), siderite (brown) and quartz. Palermo mine pegmatite, New Hampshire (USA). PPL image, 2x (Field of view = 7mm)
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Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 10x (Field of view = 2mm)
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Lazulite (high birefringence). Palermo mine pegmatite, New Hampshire (USA). XPL image, 10x (Field of view = 2mm)
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Lazulite (Azure-blue) and siderite (brown). Palermo mine pegmatite, New Hampshire (USA). PPL image, 10x (Field of view = 2mm)
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Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 10x (Field of view = 2mm)
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Lazulite (high birefringence). Palermo mine pegmatite, New Hampshire (USA). XPL image, 10x (Field of view = 2mm)
lazulite(51).jpg

Lazulite (Azure-blue) and siderite (brown). Palermo mine pegmatite, New Hampshire (USA). PPL image, 10x (Field of view = 2mm)
lazulite(61).jpg

Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 10x (Field of view = 2mm)
lazulite(62).jpg

Lazulite (high birefringence). Palermo mine pegmatite, New Hampshire (USA). XPL image, 10x (Field of view = 2mm)
lazulite(63).jpg

Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 10x (Field of view = 2mm)
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Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 10x (Field of view = 2mm)
lazulite(65).jpg

Lazulite (high birefringence). Palermo mine pegmatite, New Hampshire (USA). XPL image, 10x (Field of view = 2mm)
lazulite(73).jpg

Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 10x (Field of view = 2mm)
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Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 20x (Field of view = 1mm)
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Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 20x (Field of view = 1mm)
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Lazulite (high birefringence). Palermo mine pegmatite, New Hampshire (USA). XPL image, 20x (Field of view = 1mm)
lazulite(71).jpg

Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 20x (Field of view = 1mm)
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Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 20x (Field of view = 1mm)
lazulite(73).jpg

Lazulite (Azure-blue). Palermo mine pegmatite, New Hampshire (USA). PPL image, 20x (Field of view = 1mm)