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Phosphate mineral
LazuliteLazulite specimen found near Rapid Creek,
Yukon, Canada
Category Phosphate mineral Formula (Mg,Fe2+)Al2(PO4)2(OH)2 IMA symbol Lzl[1] Strunz classification 8.BB.40 Crystal system Monoclinic Crystal class Prismatic (2/m)Lazulite or Azure spar[6]: 14 is a transparent to semi-opaque, blue mineral that is a phosphate of magnesium, iron, and aluminium, with the chemical formula (Mg,Fe2+)Al2(PO4)2(OH)2.[3] Lazulite forms one endmember of a solid solution series with the darker, iron-rich scorzalite.[3][5]
Lazulite crystallizes in the monoclinic system. Its crystal habits include steep bipyramidal or wedge-shaped crystals.[7] Lazulite has a Mohs hardness of 5.5–6.0 and a specific gravity of 3.0–3.1. It is infusible and insoluble.[5]
Occurrence and discovery[edit] Lazulite from Laila, Gilgit District, Gilgit-Baltistan, Pakistan. Size: 2.4 cm × 1.7 cm × 0.8 cm (0.94 in × 0.67 in × 0.31 in).Lazulite forms by high-grade metamorphism of silica-rich rocks and in pegmatites. It occurs in association with quartz, andalusite, rutile, kyanite, corundum, muscovite, pyrophyllite, dumortierite, wagnerite, svanbergite, trolleite, and berlinite in metamorphic terrains; and with albite, quartz, muscovite, tourmaline and beryl in pegmatites.[2] It may be confused with lazurite, lapis lazuli or azurite.
The type locality is in Freßnitzgraben in Krieglach, it's also found in Salzburg, Austria; Zermatt, Switzerland; Minas Gerais, Brazil; Lincoln County, Georgia; Inyo County, California; the Yukon in Canada; and elsewhere.
It was first described in 1795 for deposits in Styria, Austria.[3] Its name comes from the German lazurstein, for 'blue stone'[2] or from the Arabic for heaven.[3][5]
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