gormanite

{{Infobox mineral | name = Gormanite | image = Gormanite-165270.jpg | imagesize = 260px | alt = | caption = Gormanite from the Doce valley, Minas Gerais, Brazil (size: 4.2 × 4.2 × 3.0 cm) | category = Phosphate minerals | formula = | IMAsymbol = Gm | molweight = | strunz = 8.DC.45 | dana = | system = Triclinic | class = Pedial (1) (same H-M symbol) | symmetry = P1 | unit cell = a = 11.77, b = 5.11 c = 13.57 [Å]; α = 90.45° β = 99.15°, γ = 90.05°; Z = 2 | color = Blue green | colour = | habit = Aggregates of acicular crystals; pseudomonoclinic | twinning = Polysynthetic around [010] | cleavage = {001} indistinct | fracture = Splintery | tenacity = Brittle | mohs = 4–5 | luster = Sub-vitreous, greasy | streak = Pale green | diaphaneity = Semitransparent | gravity = 3.10–3.13 | density = | polish = | opticalprop = Biaxial (−) | refractive = nα = 1.619 nβ = 1.653 nγ = 1.660 | birefringence = .041 | pleochroism = Strong, X colorless, Y blue, Z colorless | 2V = Measured: 53° | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }}

Gormanite is a phosphate mineral with the formula . It was named after the University of Toronto professor Donald Herbert Gorman (1922–2020).