Brianroulstonite Mineral Data

Brianroulstonite Mineral Data +

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General Brianroulstonite Information

Chemical Formula:

Ca3[B5O6(OH)6](OH)Cl2·8(H2O)

Composition:

Molecular Weight = 604.36 gm

Calcium 19.89 % Ca 27.84 % CaO

Boron 8.94 % B 28.80 % B₂O₃

Hydrogen 3.84 % H 34.28 % H₂O

Chlorine 11.73 % Cl 11.73 % Cl

- % Cl -2.65 % -O=Cl₂

Oxygen 55.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃(B₅O₆)(OH)₆(OH)Cl₂·8(H₂O)

Environment:

In the lower third of the Upper Halite member of the Mississippian-aged Widsor Group evaporites.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Potash Corporation of Saskatchewan Mine, 5 km east of Penobsquis, Carwell Parish, Kings County, New Brunswick, Canada. Link to MinDat.org Location Data.

Name Origin:

For Brian V. Roulston (1948-), in recognition of his work on the geology of evaporite deposits.

Synonym:

ICSD 89259

IMA1996-009

PDF 50-1632

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Brianroulstonite Crystallography

Axial Ratios:

a:b:c =2.1567:1:1.0727

Cell Dimensions:

a = 17.42, b = 8.077, c = 8.665, Z = 2; beta = 121.483° V = 1,039.71 Den(Calc)= 1.93

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Pa

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

By Intensity(I/I_o): 8.1(1), 4.04(0.4), 3.56(0.2),

Crystal Structure:

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Grice J D , Gault R A , Van Velthuizen J , The Canadian Mineralogist , 35 (1997) p.751-758, Brianroulstonite: A new borate mineral with a sheet structure

Physical Properties of Brianroulstonite

Cleavage:

[010] Perfect

Color:

Colorless, White.

Density:

1.97

Diaphaniety:

Transparent to translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Cleaveable - Easily cleaved into fragments.

Habit:

Micaceous - Platy texture with "flexible" plates.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Brianroulstonite

Gladstone-Dale:

CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2703,KPDmeas= 0.2648,KC= 0.274

Optical Data:

Biaxial (-), a=1.506, b=1.527, g=1.532, bire=0.0260, 2V(Calc)=50, 2V(Meas)=56. Dispersion none.

Calculated Properties of Brianroulstonite

Electron Density:

r_electron=1.98 gm/cc
note: r_{Brianroulstonite}=1.93 gm/cc.

Fermion Index

Fermion Index = 0.01833
Boson Index = 0.98167

Photoelectric:

PE_{Brianroulstonite}= 3.32 barns/electron
U=PE_{Brianroulstonite} x r_electron= 6.58 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brianroulstonite is Not Radioactive

Brianroulstonite Classification

Dana Class:

26.5.17.3 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.5)Dana Type

(26.5.17)Dana Group

26.5.17.1 Pringleite Ca9B26O34(OH)24Cl4·13(H2O) P1 1

26.5.17.2 Ruitenbergite Ca9B26O34(OH)24Cl4·13(H2O) P 2₁ 2

26.5.17.3 Brianroulstonite ! Ca3[B5O6(OH)6](OH)Cl2·8(H2O) Pa m

26.5.17.4 Penobsquisite! Ca2Fe[B9O13(OH)6]Cl·4(H2O) P 2₁ 2

26.5.17.5 Walkerite! Ca16(Mg,Li,[])2[B13O17(OH)12]4Cl6·28(H2O) Pba2 mm2

Strunz Class:

V/K.09-05 V - Nitrates, Carbonates and Borates

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

V/K.09 - Pringleite - Ruitenbergite series

V/K.09-05 Brianroulstonite Ca3[B5O6(OH)6](OH)Cl2·8(H2O) Pa m

V/K.09-10 Pringleite Ca9B26O34(OH)24Cl4·13(H2O) P1 1

V/K.09-20 Ruitenbergite Ca9B26O34(OH)24Cl4·13(H2O) P 2₁ 2

V/K.09-25 Walkerite! Ca16(Mg,Li,[])2[B13O17(OH)12]4Cl6·28(H2O) Pba2 mm2

V/K.09-30 Penobsquisite! Ca2Fe[B9O13(OH)6]Cl·4(H2O) P 2₁ 2

Other Brianroulstonite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p400-403,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Brianroulstonite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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

Brianroulstonite

Ca3[B5O6(OH)6](OH)Cl2·8(H2O)
Dana No: 26.5.17.3 Strunz No: V/K.09-05
Locality:

Notes: