Fabianite Mineral Data

Fabianite Mineral Data +

General Fabianite Information

Chemical Formula:

CaB3O5(OH)

Composition:

Molecular Weight = 169.51 gm

Calcium 23.64 % Ca 33.08 % CaO

Boron 19.13 % B 61.60 % B₂O₃

Hydrogen 0.59 % H 5.31 % H₂O

Oxygen 56.63 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaB₃O₅(OH)

IMA Status:

Approved IMA 1962

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 14254

PDF 15-631

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Fabianite Crystallography

Axial Ratios:

a:b:c =0.6286:1:0.6068

Cell Dimensions:

a = 6.593, b = 10.488, c = 6.365, Z = 4; beta = 113.38° V = 403.99 Den(Calc)= 2.79

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 3.963(1), 3.268(0.93), 5.244(0.83),

Crystal Structure:

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Konnert J A , Clark J R , Christ C L , Zeitschrift fur Kristallographie , 132 (1970) p.241-254, Crystal structure of fabianite, CaB3O5(OH), and comparison with the, structure of its syntheic dimorph, Locality: salt deposits near Diepholz, Germany

Physical Properties of Fabianite

Cleavage:

[011] Indistinct

Color:

Colorless.

Density:

2.77

Diaphaniety:

Transparent

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Fabianite

Gladstone-Dale:

CI meas= -0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2265,KPDmeas= 0.2282,KC= 0.22

Optical Data:

Biaxial (-), a=1.6085, b=1.6375, g=1.65, bire=0.0415

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Fabianite

Electron Density:

r_electron=2.77 gm/cc
note: r_Fabianite=2.79 gm/cc.

Fermion Index

Fermion Index = 0.03866
Boson Index = 0.96134

Photoelectric:

PE_Fabianite= 3.14 barns/electron
U=PE_Fabianite x r_electron= 8.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fabianite is Not Radioactive

Fabianite Classification

Dana Class:

25.3.3.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.3)Dana Type

(25.3.3)Dana Group

25.3.3.1 Fabianite CaB3O5(OH) P 2₁/a 2/m

Strunz Class:

V/K.01-10 V - Nitrates, Carbonates and Borates

V/K - Layered borates with complex groups [Bx(O,OH)y]

V/K.01 - Fabianite series

V/K.01-10 Fabianite CaB3O5(OH) P 2₁/a 2/m

Other Fabianite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Fabianite :
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 Fabianite Specimen Label here :

Fabianite

CaB3O5(OH)
Dana No: 25.3.3.1 Strunz No: V/K.01-10
Locality:

Notes: