Boromuscovite Mineral Data

Lapis Mineral Journal

General Boromuscovite Information

Chemical Formula:

KAl2(Si3B)O10(OH,F)2

Composition:

Molecular Weight = 383.13 gm

Potassium 10.20 % K 12.29 % K₂O

Aluminum 14.08 % Al 26.61 % Al₂O₃

Silicon 21.99 % Si 47.05 % SiO₂

Boron 2.82 % B 9.09 % B₂O₃

Hydrogen 0.39 % H 3.53 % H₂O

Oxygen 48.02 % O

Fluorine 2.48 % F 2.48 % F

- % F -1.04 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KAl₂Si₃BO₁₀(OH)_1.5F_0.5

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."

Name Pronunciation:

Boromuscovite + Pronunciation

Synonym:

IMA1989-027

Boromuscovite Image

Images:

Boromuscovite

Comments: Grayish-white coatings of boromuscovite on lavender lepidolite crystals.
Location: Little Three Mine, Ramona, San Diego County, Californi, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Boromuscovite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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]

Physical Properties of Boromuscovite

Cleavage:

{001} Perfect

Color:

White, Beige white.

Density:

2.81

Diaphaneity:

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

Optical Properties of Boromuscovite

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
Ncalc = 1.59 - 1.61

Optical Data:

Biaxial (-), a=1.557, b=1.587, g=1.593, bire=0.0360, 2V(Calc)=46, 2V(Meas)=44.

Calculated Properties of Boromuscovite

Electron Density:

Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Boromuscovite =2.81 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Boromuscovite}= 2.33 barns/electron
U=PE_{Boromuscovite} x r_electron= 6.48 barns/cc.

Radioactivity:

GRapi = 146.03 (Gamma Ray American Petroleum Institute Units)
Concentration of Boromuscovite per GRapi unit = 0.68 (%)

Estimated Radioactivity from Boromuscovite - barely detectable

Boromuscovite Classification

Dana Class:

71.02.02a.09 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.02)with 2:1 Layers

(71.02.02a)Mica Group (Muscovite subgroup)

71.02.02a.01 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

71.02.02a.02 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

71.02.02a.03 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

71.02.02a.04 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

71.02.02a.05 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m

71.02.02a.06 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

71.02.02a.06b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

71.02.02a.06c Ferroaluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

71.02.02a.06d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

71.02.02a.06e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

71.02.02a.07 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

71.02.02a.08 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

71.02.02a.09 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

71.02.02a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

71.02.02a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

71.02.02a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

Strunz Class:

09.EC.15 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.15 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

09.EC.15 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

09.EC.15 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

09.EC.15 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

09.EC.15 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m

09.EC.15 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

09.EC.15 Ferroaluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

09.EC.15 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

09.EC.15 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

09.EC.15 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

09.EC.15 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

09.EC.15 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

09.EC.15 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

09.EC.15 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

09.EC.15 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

09.EC.15 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

09.EC.15 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

Other Boromuscovite Information

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Boromuscovite

KAl2(Si3B)O10(OH,F)2
Dana No: 71.02.02a.09 Strunz No: 09.EC.15
Locality:

Notes: