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Fabianite

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Formula:
CaB3O5OH
System:
Monoclinic
Colour:
Colourless
Hardness:
6
Name:
For Hans-Joachim Fabian, geologist, Wintershall AG., Erdolwerke Niedersachsen.
This page provides mineralogical data about Fabianite.


Classification of Fabianite

Approved
6.FC.20

6 : BORATES
F : Hexaborates
C : Phyllo-hexaborates
25.3.3.1

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates
9.3.3

9 : Borates
3 : Borates of Ca and Sr

Physical Properties of Fabianite

Colour:
Colourless
Hardness (Mohs):
6
Density:
2.77(1) g/cm3 (Measured)    2.788 g/cm3 (Calculated)

Optical Data of Fabianite

Type:
Biaxial (-)
RI values:
nα = 1.609 nβ = 1.638 nγ = 1.650
2V:
Measured: 65°
Max Birefringence:
δ = 0.041
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v moderate

Chemical Properties of Fabianite

Formula:
CaB3O5OH
IMA Formula:
CaB3O5(OH)
Elements listed in formula:

Crystallography of Fabianite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group Setting:
P21/a
Cell Parameters:
a = 6.59 Å, b = 10.44 Å, c = 6.36 Å
β = 113.38°
Ratio:
a:b:c = 0.631 : 1 : 0.609
Unit Cell Volume:
V 401.64 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.27(10)
2.O75(7)
2.026(Z)
3.97(4)
3.04(4)
2.926(4)
2.149(4)
2.020(4)
1.944(4)

Type Occurrence of Fabianite

General Appearance of Type Material:
Good crystals, 0.3-25 mm in size
Geological Setting of Type Material:
rocksalt drill core
Associated Minerals at Type Locality:

Relationship of Fabianite to other Species

6.FC.05TunelliteSrB6O9(OH)2 · 3H2O
6.FC.05NobleiteCaB6O9(OH)2 · 3H2O
6.FC.10StrontioboriteSrB8O11(OH)4
6.FC.15GinoriteCa2B14O20(OH)6 · 5H2O
6.FC.15StrontioginoriteCaSrB14O20(OH)6 · 5H2O
9.3.1CalciboriteCa(B2O4)
9.3.2SibirskiteCa2(HB2O5)(OH)
9.3.4UralboriteCa2[B3O3(OH)5 · OB(OH)3]
9.3.5VimsiteCaB2O2(OH)4
9.3.6OlshanskyiteCa2[B3O3(OH)6](OH) · 3H2O
9.3.7FroloviteCa[B(OH)4]2
9.3.8KorzhinskiteCa(B2O4) · H2O
9.3.9TyretskiteCa2B5O9OH · H2O
9.3.10NifontoviteCa3B6O6(OH)12(H2O)2
9.3.12InyoiteCa(H4B3O7)(OH) · 4H2O
9.3.13GoweriteCa[B5O8(OH)][B(OH)3] · 3H2O
9.3.14ColemaniteCa[B3O4(OH)3] · H2O
9.3.15PentahydroboriteCaB2O(OH)6 · 2H2O
9.3.16HexahydroboriteCa[B(OH)4]2 · 6H2O
9.3.17MeyerhofferiteCa2(H3B3O7)2 · 4H2O
9.3.18PriceiteCa2B5O7(OH)5 · H2O
9.3.19GinoriteCa2B14O20(OH)6 · 5H2O
9.3.20ProbertiteNaCaB5O7(OH)4 · 3H2O
9.3.21UlexiteNaCa[B5O6(OH)6] · 5H2O
9.3.22HydroboraciteCaMg[B3O4(OH)3]2 · 3H2O
9.3.23InderboriteCaMg(H3B3O7)2 · 8H2O
9.3.24WardsmithiteCa5Mg[B4O7]6 · 30H2O
9.3.25HenmiliteCa2Cu[B(OH)4]2(OH)4
9.3.26StrontioboriteSrB8O11(OH)4
9.3.27VeatchiteSr2B11O16(OH)5 · H2O
9.3.28Veatchite-ASr2B11O16(OH)5 · H2O
9.3.29 P-VeatchiteSr2B11O16(OH)5 · H2O
9.3.30 BalavinskiteSr2B6O11 · 4H2O
9.3.31TunelliteSrB6O9(OH)2 · 3H2O
9.3.32StrontioginoriteCaSrB14O20(OH)6 · 5H2O

Other Names for Fabianite

Name in Other Languages:
German:Fabianit
Spanish:Fabianita

Other Information

brownish-yellow fluorescence
Other Information:
nearly insoluble in water, soluble in HCl and HNO3
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Fabianite

Reference List:
Kühn R, Roese K L, Gaertner H (1962) Fabianit CaB3O5(OH), ein neues mineral. Kali und Steinsalz 3, 285-290

Fleischer M (1963) New mineral names. American Mineralogist (1963): 48: 212.

Richard C. Erd, G. Donald Eberlein, and C. L. Christ (1969): Fabianite and its synthetic dimorph, CaB3O5(OH); new data. Can. Mineral. 10, 108-112.

Konnert J A, Clark J R, Christ C L (1970) Crystal structure of fabianite CaB3O5(OH), and comparison with the structure of its synthetic dimorph. Zeitschrift für Kristallographie: 132: 241-252.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Fabianite

mindat.org URL:
https://www.mindat.org/min-1433.html
Please feel free to link to this page.

Localities for Fabianite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany (TL)
 
  • Lower Saxony
    • Diepholz
A. Wittern: "Mineralfundorte in Deutschland", Schweizerbart (Stuttgart), 2001, 23
Mineral and/or Locality  
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