pseudobrookite

{{infobox mineral | name = Pseudobrookite | boxwidth = | boxbgcolor = | image = Pseudobrookite-219124.jpg | imagesize = | alt = | caption = Spray of pseudobrookite needles from Topaz Mountain in Utah (size: 2.7 × 2.0 × 1.6 cm) | category = Oxide mineral | formula = Fe2TiO5 | IMAsymbol = Pbrk | molweight = | strunz = 4.CB.15 | dana = | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Bbmm | unit cell = a = 9.81 Å, b = 9.95 Å, c = 3.73 Å; Z = 8 | color = Dark reddish brown, brownish black, black | colour = | habit = Prismatic to needle like, striated | twinning = | cleavage = Distinct on {010} | fracture = Uneven to subconchoidal | tenacity = | mohs = 6 | luster = Adamantine, greasy, metallic | streak = Brown | diaphaneity = Opaque, transparent in thin splinters | gravity = 4.33–4.39 | density = | polish = | opticalprop = Biaxial (+) | refractive = nα = 2.350 nβ = 2.390 nγ = 2.420 | birefringence = δ = 0.070 | pleochroism = | 2V = Measured: 50° | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }} Pseudobrookite is an iron titanium oxide mineral with formula: Fe2TiO5 or (Fe3+,Fe2+)2(2+)O5.

==Discovery and occurrence== Pseudobrookite was first described in 1878 for an occurrence in Uroi Hill (Arany Hill), Simeria, Hunedoara County, Romania. The name is from Greek ψευδής, for false, and brookite because of its misleading similar appearance to brookite.