hagendorfite

{{Infobox mineral | name = Hagendorfite | category = Iron phosphate minerals | boxwidth = | boxbgcolor = | image = Hagendorfite-sea78b.jpg | imagesize = | caption = | formula = | IMAsymbol = Hag | molweight = | strunz = 8.AC.10 | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = C2/c | unit cell = a = 11.9721(9) Å b = 12.5988(8) Å c = 6.5029(5) Å β = 114.841(8)°, Z = 4 | color = Greenish-black | habit = Massive – uniformly indistinguishable crystals forming large masses. | twinning = | cleavage = {001} good, {110} poor | fracture = | tenacity = | mohs = 3.5 | luster = | refractive = nα = 1.735 nβ = 1.742 nγ = 1.745 | opticalprop = Biaxial (-) | 2V = Measured: 68° to 70° | birefringence = 0.0100 | pleochroism = (x): Yellowish brown (y): green (z): bluish green | streak = Gray green | gravity = 3.71 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Translucent | other = | references = }}

Hagendorfite is an iron phosphate mineral with the chemical formula of and is named after where the mineral was discovered, Hagendorf-Süd, Bavaria, Germany.