Lazulite
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Lazulite is a blue, phosphate mineral containing magnesium, iron, and aluminium phosphate. Lazulite forms one endmember of a solid solution series with the darker iron rich scorzalite.
Lazulite crystallizes in the monoclinic system. Crystal habits... Wikipedia
Cleavage: Poor to good on, indistinct on
Color: Azure-blue, sky-blue, bluish white, yellow-green, blue-green, rarely green
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal habit: Tabular, acute to stubby bipyramidal crystals; granular, massive
Crystal system: Monoclinic
Formula (repeating unit): (Mg,Fe2+)Al2(PO4)2(OH)2
Luster: Vitreous
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