lazulite

{{Infobox mineral | name = Lazulite | boxwidth = | boxbgcolor = | image = Lazulite-tmix07-168a.jpg | imagesize = | alt = | caption = Lazulite specimen found near Rapid Creek, Yukon, Canada | category = Phosphate mineral | formula = | IMAsymbol = Lzl | molweight = | strunz = 8.BB.40 | dana = | system = Monoclinic | class = Prismatic (2/m) (same H–M symbol) | symmetry = P21/c | unit cell = a = 7.144(1), b = 7.278(1) c = 7.228(1) [Å]; β = 120.5(1)°; Z = 2 | color = Azure, sky blue, bluish white, yellow-green, blue-green, rarely green | habit = Tabular, acute to stubby bipyramidal crystals; granular, massive | twinning = Common by several twin laws | cleavage = Poor to good on {110}, indistinct on {101} | fracture = Uneven, splintery | tenacity = Brittle | mohs = 5.5–6.0 | luster = Vitreous | streak = White | diaphaneity = Transparent to translucent to nearly opaque | gravity = 3.122–3.240 | opticalprop = Biaxial (−) | refractive = nα = 1.604–1.626nβ = 1.626–1.654nγ = 1.637–1.663 | birefringence = δ = 0.033–0.037 | pleochroism = Strong: X = colorless, Y = blue, Z = darker blue | 2V = Measured: 61–70° | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = Infusible | diagnostic = | solubility = Insoluble | impurities = | alteration = | other = | references = }}

Lazulite or Azure spar is a transparent to semi-opaque, blue mineral that is a phosphate of magnesium, iron, and aluminium, with the chemical formula . Lazulite forms one endmember of a solid solution series with the darker, iron-rich scorzalite.