Borcarite Mineral Data

Borcarite Mineral Data +

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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

IMA Status:

Approved IMA 1965

Locality:

Link to MinDat.org Location Data.

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

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:

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drag2 - RMB Resize/Rotate
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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

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:

r_electron=2.80 gm/cc
note: r_Borcarite=2.79 gm/cc.

Fermion Index

Fermion Index = 0.02134
Boson Index = 0.97866

Photoelectric:

PE_Borcarite= 3.85 barns/electron
U=PE_Borcarite x r_electron= 10.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Borcarite is Not Radioactive

Borcarite Classification

Dana Class:

27.1.3.1 (27)Compound Borates

(27.1)Dana Type

(27.1.3)Dana Group

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

Strunz Class:

V/H.13-10 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.13 - Borcarite series

V/H.13-10 Borcarite Ca4MgB4O6(OH)6(CO3)2 C 2/m 2/m

Other Borcarite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Borcarite

Ca4MgB4O6(OH)6(CO3)2
Dana No: 27.1.3.1 Strunz No: V/H.13-10
Locality:

Notes: