Lazulite

Formula: MgAl2(PO4)2(OH)2

Colour: Blue, sky-blue, bluish white

Lustre: Vitreous, Sub-Vitreous, Resinous, Greasy

Hardness: 5½ – 6

Specific Gravity: 3.122 – 3.24

Crystal System: Monoclinic. Crystals are pyramidal, with tabular prism faces; it can also be massive and granular

Member of: Lazulite Group

Name: Named in 1795 by Martin H. Klaproth from the Arabic word meaning “heaven,” in allusion to its colour.

Type Locality: Freßnitzgraben, Krieglach, Bruck-Mürzzuschlag District, Styria, Austria

The magnesium analogue of Scorzalite. Not to be confused with the similarly named lazurite.

Lazulite occurs in aluminous metamorphic rocks, quartz veins, and granite pegmatites.