bobfergusonite

{{Infobox mineral | name = Bobfergusonite | category = Phosphate mineral | image = | caption = | formula = Na2Mn5FeAl(PO4)6 | IMAsymbol=Bfg | molweight = | strunz = 8.AC.15 | dana = 38.2.4.5 | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/n | unit cell = a = 12.773 Å, b = 12.486 Å,c = 11.038 Å; β = 114.35(13)°; Z = 4 | color = Green-brown to red-brown | habit = | twinning = | cleavage = Perfect on {010}Parting on {100} | fracture = Irregular/Uneven | tenacity = Brittle | mohs = 4 | luster = Sub-vitreous, resinous, greasy | polish = | refractive = nα = 1.694(1) nβ = 1.698(1) nγ = 1.715(2) | opticalprop = Biaxial (+) | birefringence = δ = 0.021 | 2V = 46° | dispersion = Relatively strong | pleochroism = Visible: X=Y= yellow-orange Z= orange | fluorescence= Not fluorescent | absorption = | streak = Yellow-brown | gravity = | density = 3.54 g/cm3 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Translucent to transparent | other = | references = }}

Bobfergusonite is a mineral with formula Na2Mn5FeAl(PO4)6. The mineral varies in color from green-brown to red-brown. It was discovered in 1986 in Manitoba, Canada, and named for Robert Bury Ferguson (19202015), a professor of geological sciences at the University of Manitoba. , the mineral has only been found in Canada and Argentina.