Mineraller ve √∂zellikleri Muskovit General Muscovite Information Chemical Formula: KAl2(Si3Al)O10(OH,F)2 Composition: Molecular Weight = 398.71 gm Potassium 9.81 % K 11.81 % K 2 O Aluminum 20.30 % Al 38.36 % Al 2 O 3 Silicon 21.13 % Si 45.21 % SiO 2 Hydrogen 0.46 % H 4.07 % H 2 O Oxygen 47.35 % O Fluorine 0.95 % F 0.95 % F - % F -0.40 % -O=F 2 ______ ______ 100.00 % 100.00 % = TOTAL OXIDE Empirical Formula: KAl 3Si3O 10(OH)1.8F 0.2 Environment: Granites and pegmatites. IMA Status: Approved IMA 1959 Locality: Common world wide. Link to MinDat.org Location Data. Name Origin: From Muscovy glass, alluding to the Russian province of Muscovy. Synonym: Binnite (Ba) Fuchsite (Cr) Isinglass Potash Mica Muscovite Crystallography Axial Ratios: a:b:c =0.5747:1:2.2203 Cell Dimensions: a = 5.19, b = 9.03, c = 20.05, Z = 4; beta = 95.5¬į V = 935.33 Den(Calc)= 2.83 Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m X Ray Diffraction: By Intensity(I/I o): 3.32(1), 9.95(0.95), 2.57(0.55), 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: [ 2 2 1] [ 1 1 1] [ 0 1 0] [ 0 0 1] Warning: this large pop-up is very compute intensive and may not work well with some computers. Physical Properties of Muscovite Cleavage: [001] Perfect Color: White, Gray, Silver white, Brownish white, Greenish white. Density: 2.77 - 2.88, Average = 2.82 Diaphaniety: Transparent to translucent Fracture: Brittle - Sectile - Brittle fracture with slightly sectile shavings possible. Habits: Massive - Lamellar - Distinctly foliated fine-grained forms., Foliated - Two dimensional platy forms., Micaceous - Platy texture with "flexible" plates. Hardness: 2-2.5 - Gypsum-Finger Nail Luminescence: None. Luster: Vitreous (Glassy) Streak: white Optical Properties of Muscovite Gladstone-Dale: CI meas= 0.015 (Superior) - where the CI = (1- KPDmeas/KC) CI calc= 0.017 (Superior) - where the CI = (1- KPDcalc/KC) KPDcalc= 0.2073,KPDmeas= 0.2077,KC= 0.2109 Optical Data: Biaxial (?), a=1.552-1.574, b=1.582-1.61, g=1.586- 1.616, bire=0.0340-0.0420, 2V(Calc)=38-42, 2V(Meas)=30-47. Dispersion weak to distinct, r > v. Pleochroism (x): colorless or robins egg blue. Pleochroism (y): colorless, very pale green, yellow, or pale yellowish green. Pleochroism (z): colorless, pale green, blue green, or bright chrome green. Muscovite Classification Dana Class: 71.2.2a.1 (71)Phyllosilicate Sheets of Six-Membered Rings (71.2)with 2:1 Layers (71.2.2a)Mica Group (Muscovite subgroup) 71.2.2a.1 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m 71.2.2a.2 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono 71.2.2a.3 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m 71.2.2a.4 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m 71.2.2a.5 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m 71.2.2a.6 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m 71.2.2a.6b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m 71.2.2a.6c Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m 71.2.2a.6d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m 71.2.2a.6e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2 71.2.2a.7 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m 71.2.2a.8 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m 71.2.2a.9 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m 71.2.2a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m 71.2.2a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m 71.2.2a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m Strunz Class: VIII/H.10-70 VIII - Silicates VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups VIII/H.10 - Mica group, Muscovite series VIII/H.10-10 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m VIII/H.10-20 Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m VIII/H.10-30 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m VIII/H.10-35 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2 VIII/H.10-40 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m VIII/H.10-50 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono VIII/H.10-60 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m VIII/H.10-70 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m VIII/H.10-80 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m VIII/H.10-90 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m VIII/H.10-100 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m VIII/H.10-110 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m