ianbruceite

{{Infobox mineral | name = Ianbruceite | category = Zinc arsenates | boxwidth = 24 | boxbgcolor = | image = | caption = | formula = [Zn2(OH)(H2O)(AsO4)](H2O)2 | IMAsymbol = Ibc | molweight = | strunz = 8.DA.50 | dana = 42 (hydrated phosphates, arsenates and vanadates containing hydroxyl or halogen) | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/b | color = Sky blue to very pale blue at Tsumeb, white to pale pink in the Caldbeck Fells | habit = Radiating aggregates of lath-like crystals with a distinctive diamond-shaped outline {100} | twinning = | cleavage = Perfect parallel to (100) | fracture = Crystals are flexible and deform plastically | tenacity = | mohs = 1 | luster = Vitreous | refractive = nα = 1.601, nβ = 1.660, nγ = 1.662 | opticalprop = Biaxial | birefringence = | pleochroism = | streak = White | gravity = Calculated, 3.197 | melt = | fusibility = | diagnostic = | solubility = Insoluble in dilute acid | diaphaneity = | other = It may dehydrate, and it can readily absorb alcohol. Not fluorescent under ultraviolet light | references = }}

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