geology : Ilmenite

Jun 28th, 2015
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Ilmenite from Miass, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia. 4.5 x 4.3 x 1.5 cm

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IlmeniteIlmenite from Miass, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia. 4.5 x 4.3 x 1.5 cmGeneralCategoryOxide mineralFormula(repeating unit)iron titanium oxide,FeTiO3Strunz classification04.CB.05Dana classification04.03.05.01Crystal symmetryTrigonal rhombohedralH-M symbol:3Space group: R3Unit cella = 5.08854(7) , c = 14.0924(3) : Z=6IdentificationColorIron-black; gray with a brownish tint in reflected lightCrystal habitGranular to massive and lamellar exsolutions in hematite or magnetiteCrystal systemTrigonalTwinning{0001} simple, {1011} lamellarCleavageabsent; parting on {0001} and {1011}FractureConchoidal to subconchoidalTenacityBrittleMohs scalehardness5-6LusterMetallic to submetallicStreakBlackDiaphaneityOpaqueSpecific gravity4.70-4.79Optical propertiesUniaxial (-)BirefringenceStrong; O = pinkish brown, E = dark brown (bireflectance)Other characteristicsweakly magneticReferences[1][2][3]MagnetiteMagnetite and pyrite from Piedmont, ItalyGeneralCategoryOxide mineralsSpinel groupSpinel structural groupFormula(repeating unit)iron(II,III) oxide, Fe2+Fe3+2O4Strunz classification04.BB.05Crystal symmetryIsometric 4/m32/mUnit cella = 8.397 ; Z=8IdentificationColorBlack, gray with brownish tint in reflected sunCrystal habitOctahedral, fine granular to massiveCrystal systemIsometricHexoctahedralTwinningOn {Ill} as both twin and composition plane, the spinel law, as c

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