larnite

{{Infobox mineral | name = Larnite | image = | imagesize = | alt = | caption = | category = Nesosilicates | formula = | IMAsymbol = Lrn | strunz = 9.AD.05 | dana = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/n | unit cell = a = 5.5, b = 6.74 c = 9.29 [Å]; β = 94.59°; Z = 4 | color = White to gray | habit = Flattened anhedral grains; massive | twinning = Common, polysynthetic parallel to {100} | cleavage = Good on {100}, imperfect on {010} | fracture = | tenacity = | mohs = 6 | luster = Vitreous | streak = White | diaphaneity = Transparent to translucent | gravity = 3.28–3.33 | density = | polish = | opticalprop = Biaxial (+) | refractive = nα = 1.707 nβ = 1.715 nγ = 1.730 | birefringence = δ = 0.023 | pleochroism = | 2V = 74° calculated | dispersion = r > v | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = }}

Larnite is a calcium silicate mineral with the formula . It is the calcium member of the olivine group of minerals.