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:

Numanoite Borcarite

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 - Prismatic H-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),

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

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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:

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