Mineraller ve özellikleri Magnetit General Magnetite Information Chemical Formula: Fe++Fe+++2O4 Composition: Molecular Weight = 231.54 gm Iron 72.36 % Fe 31.03 % FeO / 68.97 % Fe 2 O 3 Oxygen 27.64 % O ______ ______ 100.00 % 100.00 % = TOTAL OXIDE Empirical Formula: Fe 3+ 2Fe 2+ O 4 IMA Status: Valid Species (Pre-IMA) Locality: Many localities world wide. Link to MinDat.org Location Data. Name Origin: From it's being attracted by a magnet. Synonym: ICSD 65339 Lodestone Magnetic iron ore PDF 19-629 Magnetite Crystallography Cell Dimensions: a = 8.391, Z = 8; V = 590.80 Den(Calc)= 5.21 Crystal System: Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m X Ray Diffraction: By Intensity(I/I o): 2.53(1), 1.483(0.85), 1.614(0.85), Forms: Mouse Dbl Clk - Start-Stop Rotation RMB - Cycle Display Modes Drag1 - Manipulate Crystal Drag2 - Resize Keyboard S - Stereo I - Indicies - Start-Stop Rotation F - Fit to Screen M - Menu Help on Above Forms: [ 1 1 1] Warning: this large pop-up is very compute intensive and may not work well with some computers. Physical Properties of Magnetite Cleavage: None Color: Grayish black, Iron black. Density: 5.1 - 5.2, Average = 5.15 Diaphaniety: Opaque Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. Habits: Massive - Uniformly indistinguishable crystals forming large masses., Massive - Granular - Common texture observed in granite and other igneous rock., Crystalline - Fine - Occurs as w ell- formed fine sized crystals. Hardness: 5.5-6 - Knife Blade-Orthoclase Luminescence: None. Luster: Metallic Magnetism: Naturally strong Streak: black Optical Properties of Magnetite Optical Data: Isotropic, n=2.42. RL Color: Gray with brownish tint. Reflectivity Standardized Intensity (100%) Reflection Spectra of Magnetite in Air ? R ? R (? ) 400 nm 22.30 420 nm 21.80 440 nm 21.30 460 nm 20.80 480 nm 20.50 500 nm 20.30 520 nm 20.30 540 nm 20.40 560 nm 20.50 580 nm 20.60 600 nm 20.60 620 nm 20.70 640 nm 20.80 660 nm 20.90 680 nm 21.00 700 nm 21.20 Calculated Relative Intensity Colors of Magnetite in Air Relative Intensity 0% 50% 100% 150% 200% 250% 300% 350% 400% 430% R Magnetite Classification Dana Class: 7.2.2.3 (7)Multiple Oxides (7.2)(A+ B++)2 X4 Spinel group (7.2.2)(Iron subgroup) 7.2.2.1 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m 7.2.2.2 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m 7.2.2.3 Magnetite FeFe2O4 F d3m 4/m 3 2/m 7.2.2.4 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m 7.2.2.5 Trevorite NiFe2O4 F d3m 4/m 3 2/m 7.2.2.6 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m 7.2.2.7 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m Strunz Class: IV/B.02-20 IV - Oxides IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related), Ferrite-Spinels IV/B.02 - Spinel group, Magnesioferrite - Franklinite series IV/B.02-10 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m IV/B.02-20 Magnetite FeFe2O4 F d3m 4/m 3 2/m IV/B.02-30 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m IV/B.02-40 Trevorite NiFe2O4 F d3m 4/m 3 2/m IV/B.02-50 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m IV/B.02-60 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m