Mineraller ve özellikleri Hematit General Hematite Information Chemical Formula: Fe2O3 Composition: Molecular Weight = 159.69 gm Iron 69.94 % Fe 100.00 % Fe 2 O 3 Oxygen 30.06 % O ______ ______ 100.00 % 100.00 % = TOTAL OXIDE Empirical Formula: Fe 3+ 2O 3 Environment: Magmatic, hydrothermal, metamorphic and sedimentary. IMA Status: Valid Species (Pre-IMA) Locality: Matto Grosso, Brazil. Mesabi iron ore range, Minnesota, USA. Link to MinDat.org Location Data. Name Origin: From the Greek, haimatites, "bloodlike'" in allusion to vivid red color of the powder. Synonym: ICSD 64599 Kidney Ore Martite PDF 33-664 Specularite Hematite Crystallography Axial Ratios: a:c = 1:2.73009 Cell Dimensions: a = 5.0317, c = 13.737, Z = 6; V = 301.20 Den(Calc)= 5.28 Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c X Ray Diffraction: By Intensity(I/I o): 2.69(1), 1.69(0.6), 2.51(0.5), 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: [ 0 0 1] [ 1 0 1] Warning: this large pop-up is very compute intensive and may not work well with some computers. Physical Properties of Hematite Cleavage: None Color: Reddish gray, Black, Blackish red. Density: 5.3 Diaphaniety: Subtranslucent to opaque Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). Habits: Tabular - Form dimensions are thin in one direction., Blocky - Crystal shape tends to be equant (e.g. feldspars)., Earthy - Dull, clay-like texture with no visible crystalline affinit ies, (e.g. howlite). Hardness: 6.5 - Pyrite Luminescence: None. Luster: Metallic Magnetism: Magnetic after heating Streak: reddish brown Optical Properties of Hematite Dichroism (e): yellowish red. Dichroism (w): brownish red. Gladstone- Dale: CI meas= -0.225 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.23 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.3873,KPDmeas= 0.3858,KC= 0.315 Optical Data: Uniaxial (-), e=2.87-2.94, w=3.15-3.22, bire=0.2800. RL Color: White to gray white, with a bluish tint, with deep blood-red internal reflections. Reflectivity Standardized Intensity (100%) Reflection Spectra of Hematite in Air ? R1 R2 ? R1 (? ) ? R2 (? ) 400 nm 32.00 34.50 420 nm 31.00 34.00 440 nm 30.00 33.50 460 nm 29.10 32.70 480 nm 28.40 32.20 500 nm 27.80 31.60 520 nm 27.20 31.00 540 nm 27.00 30.60 560 nm 26.80 30.40 580 nm 26.40 30.00 600 nm 25.50 29.20 620 nm 24.80 28.30 640 nm 24.10 27.50 660 nm 23.50 26.70 680 nm 23.10 26.10 700 nm 22.80 25.60 Calculated Relative Intensity Colors of Hematite in Air Relative Intensity 0% 40% 80% 100% 120% 160% 200% 240% 280% 320% 350% R1 R2 Hematite Classification Dana Class: 4.3.1.2 (4)Simple Oxides (4.3)with a cation charge of 3+ (A+++2 O3) (4.3.1)Corundum-Hematite group (Rhombohedral: R3¯c) 4.3.1.1 Corundum Al2O3 R 3c 3 2/m 4.3.1.2 Hematite Fe2O3 R 3c 3 2/m 4.3.1.3 Eskolaite Cr2O3 R 3c 3 2/m 4.3.1.4 Karelianite V2O3 R 3c 3 2/m Strunz Class: IV/C.04-20 IV - Oxides IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds) IV/C.04 - Hematite group IV/C.04-10 Corundum Al2O3 R 3c 3 2/m IV/C.04-20 Hematite Fe2O3 R 3c 3 2/m IV/C.04-30 Eskolaite Cr2O3 R 3c 3 2/m IV/C.04-40 Karelianite V2O3 R 3c 3 2/m