Borcarite Mineral Data

General Borcarite Information

Chemical Formula:

Ca4MgB4O6(OH)6(CO3)2

Composition:

Molecular Weight = 545.92 gm

Calcium 29.37 % Ca 41.09 % CaO

Magnesium 4.45 % Mg 7.38 % MgO

Boron 7.92 % B 25.51 % B₂O₃

Hydrogen 1.11 % H 9.90 % H₂O

Carbon 4.40 % C 16.12 % CO₂

Oxygen 52.75 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄MgB₄O₆(OH)₆(CO₃)₂

Environment:

In kotoite marbles, near the contact with granodiorite.

IMA Status:

Approved IMA 1965

Locality:

Snezhnoye boron deposit, Izvestkovyi stream, Tas-Khayakhtakh Range, Polar Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the BORate and CARbonate in the composition.

Name Pronunciation:

Borcarite + Pronunciation

Synonym:

ICSD 80438

PDF 22-532

Borcarite Image

Images:

Borcarite Szaibelyite

Comments: Pale aqua granular borcarite with white fibrous to granular szaibelyite.
Location: Nalednoya, Republic of Sakha, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Borcarite Numanoite

Comments: Zoned borcarite (Bc) crystal with a core of green numanoite (Nm). CanMin 45:307.
Location: Fuka mine, 40 km west-northwest of Okayama City, western Japan. Scale: See Image.
© Canadian Mineralogist

Borcarite Crystallography

Axial Ratios:

a:b:c =2.1288:1:0.5304

Cell Dimensions:

a = 17.84, b = 8.38, c = 4.445, Z = 2; beta = 102.04° V = 649.91 Den(Calc)= 2.79

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): 1.886(1), 2.67(1), 7.57(1),

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

Burns P C , Hawthorne F C , Mineralogical Magazine , 59 (1995) p.297-304, Hydrogen bonding in borcarite, an unusual borate-carbonate mineral, Locality: Yakutskaya, Russia

Physical Properties of Borcarite

Cleavage:

{100} Perfect, {110} Perfect

Color:

Blue green, Colorless, Green, Greenish blue.

Density:

2.77

Hardness:

4 - Fluorite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Borcarite

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2268,KPDmeas= 0.2284,KC= 0.2236
Ncalc = 1.62

Optical Data:

Biaxial (-), a=1.59, b=1.651, g=1.657, bire=0.0670, 2V(Calc)=32, 2V(Meas)=30.

Calculated Properties of Borcarite

Electron Density:

Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Borcarite =2.79 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Borcarite= 3.85 barns/electron
U=PE_Borcarite x rElectron Density= 10.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Borcarite is Not Radioactive

Borcarite Classification

Dana Class:

27.01.03.01 (27)Compound Borates

(27.01)Dana Type

(27.01.03)Dana Group

27.01.03.01 Borcarite Ca4MgB4O6(OH)6(CO3)2 C 2/m 2/m

27.01.03.02 Numanoite! Ca4CuB4O6(OH)6(CO3)2 C 2/m 2/m

Strunz Class:

06.DA.40 06 - BORATES

06.D - Tetraborates

06.DA -Neso-tetraborates

06.DA.40 Borcarite Ca4MgB4O6(OH)6(CO3)2 C 2/m 2/m

06.DA.40 Numanoite! Ca4CuB4O6(OH)6(CO3)2 C 2/m 2/m

Other Borcarite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(Am.Min.,Vol.81,1996)

See Also:

Links to other databases for Borcarite :
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
15 - WWW-MINCRYST

Search for Borcarite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Borcarite :

A Bijoux Google Search for Borcarite
Adam's Minerals Google Search for Borcarite
Cape Minerals Google Search for Borcarite
Dakota Matrix Minerals Google Search for Borcarite
Excalibur Mineral Corp. Google Search for Borcarite
Exceptional Minerals Google Search for Borcarite
John Betts Fine Minerals Search for Borcarite
McDougall Minerals Google Search for Borcarite
Mineral News Website Link
Rock and Mineral Shows Google Search for Borcarite
Weinrich Minerals, Inc. Google Search for Borcarite

Ask about Borcarite 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 Borcarite Specimen Label here :

Borcarite

Ca4MgB4O6(OH)6(CO3)2
Dana No: 27.01.03.01 Strunz No: 06.DA.40
Locality:

Notes: