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.

Name Pronunciation:

Brianroulstonite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.53 - 1.54

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:

Bulk Density (Electron Density)=1.98 gm/cc
note: Specific Gravity of Brianroulstonite =1.93 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

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

Brianroulstonite Classification

Dana Class:

26.05.17.03 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.17)Pringleite Group

26.05.17.01 Pringleite Ca9B26O34(OH)24Cl4•13(H2O) P1 1

26.05.17.02 Ruitenbergite Ca9B26O34(OH)24Cl4•13(H2O) P 2₁ 2

26.05.17.03 Brianroulstonite! Ca3[B5O6(OH)6](OH)Cl2•8(H2O) Pa m

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

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

Strunz Class:

06.EC.35 06 - BORATES

06.E - Pentaborates

06.EC -Phyllo-pentaborates

06.EC.35 Brianroulstonite! Ca3[B5O6(OH)6](OH)Cl2•8(H2O) Pa m

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 (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info

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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: 26.05.17.03 Strunz No: 06.EC.35
Locality:

Notes: