Mineraller ve özellikleri Galen General Galena Information Chemical Formula: PbS Composition: Molecular Weight = 239.27 gm Lead 86.60 % Pb Sulfur 13.40 % S ______ 100.00 % Empirical Formula: PbS Environment: Lead sulfide ore veins, and disseminated in igneous and sedimentary rocks. IMA Status: Valid Species (Pre-IMA) Locality: Joplin district of Missouri, Kansas, and Oklahoma and other world wide occurrences. Link to MinDat.org Location Data. Name Origin: The Roman naturalist, Pliny, used the name galena to describe lead ore. Synonym: Blue Lead ICSD 38293 Lead Glance PDF 5-592 Galena Crystallography Cell Dimensions: a = 5.936, Z = 4; V = 209.16 Den(Calc)= 7.60 Crystal System: Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m X Ray Diffraction: By Intensity(I/I o): 2.969(1), 3.429(0.84), 2.099(0.57), 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 0 0] [ 1 1 1] Warning: this large pop-up is very compute intensive and may not work well with some computers. Physical Properties of Galena Cleavage: [001] Perfect, [010] Perfect, [100] Perfect Color: Light lead gray, Dark lead gray. Density: 7.2 - 7.6, Average = 7.4 Diaphaniety: Opaque Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals. Habits: Euhedral Crystals - Occurs as well-formed crystals showing good external form., Massive - Granular - Common texture observed in granite and other igneous rock., Massive - Uniformly in distinguishable crystals forming large m Hardness: 2.5 - Finger Nail Luminescence: None. Luster: Metallic Magnetism: Nonmagnetic Streak: grayish black Optical Properties of Galena RL Color: White. Reflectivity Standardized Intensity (100%) Reflection Spectra of Galena in Air ? R ? R (? ) 400 nm 52.80 420 nm 50.50 440 nm 48.20 460 nm 46.40 480 nm 45.00 500 nm 43.90 520 nm 43.00 540 nm 42.40 560 nm 41.90 580 nm 41.60 600 nm 41.50 620 nm 41.60 640 nm 41.80 660 nm 41.90 680 nm 42.10 700 nm 42.20 Calculated Relative Intensity Colors of Galena in Air Relative Intensity 0% 30% 60% 90% 100% 120% 150% 180% 210% R Galena Classification Dana Class: 2.8.1.1 (2)Sulfides - Including Selenides and Tellurides (2.8)where Am Bn Xp, with (m+n):p=1:1 (2.8.1)Galena Group (Isometric: Fm3m) 2.8.1.1 Galena PbS F m3m 4/m 3 2/m 2.8.1.2 Clausthalite PbSe F m3m 4/m 3 2/m 2.8.1.3 Altaite PbTe F m3m 4/m 3 2/m 2.8.1.4 Alabandite MnS F m3m 4/m 3 2/m 2.8.1.5 Oldhamite (Ca,Mg,Fe)S F m3m 4/m 3 2/m 2.8.1.6 Niningerite (Mg,Fe,Mn)S F m3m 4/m 3 2/m 2.8.1.7 Borovskite Pd3SbTe4 F m3m 4/m 3 2/m 2.8.1.8 Crerarite (Pt,Pb)Bi3(S,Se)4-x(x~0.7) F m3m 4/m 3 2/m 2.8.1.9 Keilite! (Fe,Mg)S F m3m 4/m 3 2/m Strunz Class: II/C.15-40 II - Sulfides and sulphosalts II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1 II/C.15 - Galenite group II/C.15-05 Keilite! (Fe,Mg)S F m3m 4/m 3 2/m II/C.15-10 Niningerite (Mg,Fe,Mn)S F m3m 4/m 3 2/m II/C.15-20 Oldhamite (Ca,Mg,Fe)S F m3m 4/m 3 2/m II/C.15-30 Alabandite MnS F m3m 4/m 3 2/m II/C.15-40 Galena PbS F m3m 4/m 3 2/m II/C.15-50 Clausthalite PbSe F m3m 4/m 3 2/m II/C.15-60 Altaite PbTe F m3m 4/m 3 2/m II/C.15-70 Crerarite (Pt,Pb)Bi3(S,Se)4-x(x~0.7) F m3m 4/m 3 2/m