General Boromuscovite Information
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Chemical Formula: |
KAl2(Si3B)O10(OH,F)2 |
Composition: |
Molecular Weight = 383.13 gm |
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Potassium 10.20 % K 12.29 % K2O |
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Aluminum 14.08 % Al 26.61 % Al2O3 |
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Silicon 21.99 % Si 47.05 % SiO2 |
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Boron 2.82 % B 9.09 % B2O3 |
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Hydrogen 0.39 % H 3.53 % H2O |
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Oxygen 48.02 % O |
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Fluorine 2.48 % F 2.48 % F |
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- % F -1.04 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
KAl2Si3BO10(OH)1.5F0.5 |
Environment: |
Occurs as a coating on other minerals on the floor of a pegmatite pocket, hydrothermally deposited after rupture of the pocket. |
IMA Status: |
Approved IMA 1991 |
Locality: |
From the Little Three mine, Ramona district, San Diego County, California, USA. Link to MinDat.org Location Data. |
Name Origin: |
Presumably for the BOROn content and relation to "muscovite." |
Synonym: |
IMA1989-027 |
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Boromuscovite Image |
Images:
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Boromuscovite Crystallography
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Axial Ratios: |
a:b:c =0.5785:1:1.1465 |
Cell Dimensions: |
a = 5.077, b = 8.775, c = 10.061, Z = 2; beta = 101.31° V = 439.52 Den(Calc)= 2.89 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
X Ray Diffraction: |
By Intensity(I/Io): 3.569(1), 2.505(0.8), 3.008(0.8), |
Crystal Structure:
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Liang J , Hawthorne F C , Novak M , Cerny P , The Canadian Mineralogist , 33 (1995) p.859-865, Crystal-structure refinement of boromuscovite polytypes using a coupled, Rietveld-static-structure energy-minimization method, Sample: 2M1 polytype, Locality: Recice, Czech Republic
View Additional jPOWD Structure files for Boromuscovite
[1]
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Physical Properties of Boromuscovite
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Cleavage: |
[001] Perfect |
Color: |
White, Beige white. |
Density: |
2.81 |
Diaphaniety: |
Opaque |
Habit: |
Crystalline - Fine - Occurs as well-formed fine sized crystals. |
Habit: |
Massive - Fibrous - Distinctly fibrous fine-grained forms. |
Hardness: |
2.5-3 - Finger Nail-Calcite |
Luster: |
Vitreous - Dull |
Streak: |
white |
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Optical Properties of Boromuscovite
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Gladstone-Dale: |
CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2003,KPDmeas= 0.206,KC= 0.2097 |
Optical Data: |
Biaxial (-), a=1.557, b=1.587, g=1.593, bire=0.0360, 2V(Calc)=46, 2V(Meas)=44. |
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Calculated Properties of Boromuscovite
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Electron Density: |
relectron=2.79 gm/cc note: rBoromuscovite =2.81 gm/cc. |
Fermion Index |
Fermion Index = 0.01612 Boson Index = 0.98388 |
Photoelectric: |
PEBoromuscovite = 2.33 barns/electron U=PEBoromuscovite x relectron= 6.48 barns/cc. |
Radioactivity: |
GRapi = 146.03 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Boromuscovite - barely detectable
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Boromuscovite Classification
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Dana Class: |
71.2.2a.9 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.2)with 2:1 Layers |
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(71.2.2a)Mica Group (Muscovite subgroup) |
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71.2.2a.1 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m |
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71.2.2a.2 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono |
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71.2.2a.3 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m |
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71.2.2a.4 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m |
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71.2.2a.5 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m |
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71.2.2a.6 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m |
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71.2.2a.6b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m |
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71.2.2a.6c Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m |
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71.2.2a.6d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m |
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71.2.2a.6e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2 |
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71.2.2a.7 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m |
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71.2.2a.8 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m |
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71.2.2a.9 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m |
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71.2.2a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m |
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71.2.2a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m |
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71.2.2a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m |
Strunz Class: |
VIII/H.10-60 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups |
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VIII/H.10 - Mica group, Muscovite series |
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VIII/H.10-10 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m |
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VIII/H.10-20 Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m |
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VIII/H.10-30 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m |
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VIII/H.10-35 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2 |
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VIII/H.10-40 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m |
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VIII/H.10-50 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono |
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VIII/H.10-60 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m |
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VIII/H.10-70 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m |
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VIII/H.10-80 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m |
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VIII/H.10-90 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m |
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VIII/H.10-95 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m |
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VIII/H.10-100 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m |
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VIII/H.10-110 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m |
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Other Boromuscovite Information
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References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.76,p1998-2002,1991) OPTIC PROP.(Am.Min.,Vol.76,p1998-2002,1991) |
See Also: |
Links to other databases for Boromuscovite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 -École des Mines de Paris
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Print or Cut-and-Paste your Boromuscovite Specimen Label here :
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Boromuscovite
KAl2(Si3B)O10(OH,F)2
Dana No: 71.2.2a.9 Strunz No: VIII/H.10-60
Locality:
Notes:
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