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)

Environment:

Marine evaporite deposit.

IMA Status:

Approved IMA 1962

Locality:

Drill core at Rehden, near Diepholz, Lower Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Hans-Joachim Fabian, German geologist.

Name Pronunciation:

Fabianite + Pronunciation

Synonym:

ICSD 14254

PDF 15-631

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 - Prismatic H-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),

Physical Properties of Fabianite

Cleavage:

{011} Indistinct

Color:

Colorless.

Density:

2.77

Diaphaneity:

Transparent

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent, Short UV=brownish yellow, Long UV=brownish yellow.

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
Ncalc = 1.61

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:

Bulk Density (Electron Density)=2.77 gm/cc
note: Specific Gravity of Fabianite =2.79 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Fabianite= 3.14 barns/electron
U=PE_Fabianite x rElectron Density= 8.69 barns/cc.

Radioactivity:

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

Fabianite Classification

Dana Class:

25.03.03.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.03)Dana Type

(25.03.03)Dana Group

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

Strunz Class:

06.FC.20 06 - BORATES

06.F - Hexaborates

06.FC -Phyllo-hexaborates

06.FC.20 Fabianite CaB3O5(OH) P 2₁/a 2/m

Other Fabianite Information

References:

NAME( AntBidBlaNic5) 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 - 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 Fabianite Specimen Label here :

Fabianite

CaB3O5(OH)
Dana No: 25.03.03.01 Strunz No: 06.FC.20
Locality:

Notes:

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