Boromuscovite Mineral Data

Boromuscovite Mineral Data +

[Current Minerals] [Order Status] [Policies] [e-Bay Items]
B & L Minerals, Fine Mineral specimens for sale for collectors of all levels

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."

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

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

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

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:

r_electron=2.79 gm/cc
note: r_{Boromuscovite}=2.81 gm/cc.

Fermion Index

Fermion Index = 0.01612
Boson Index = 0.98388

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)

Estimated Radioactivity from Boromuscovite - barely detectable

Boromuscovite Classification

Dana Class:

71.2.2a.9 (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.10-60 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.10-95 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 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

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 -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

Search for Boromuscovite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Boromuscovite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Boromuscovite Mineral Data :

Ask about Boromuscovite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Boromuscovite Specimen Label here :

Boromuscovite

KAl2(Si3B)O10(OH,F)2
Dana No: 71.2.2a.9 Strunz No: VIII/H.10-60
Locality:

Notes: