Brianroulstonite Mineral Data

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

Search for Brianroulstonite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

Search for Brianroulstonite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Brianroulstonite :

A Bijoux Google Search for Brianroulstonite
Adam's Minerals Google Search for Brianroulstonite
Cape Minerals Google Search for Brianroulstonite
Dakota Matrix Minerals Google Search for Brianroulstonite
Excalibur Mineral Corp. Google Search for Brianroulstonite
Exceptional Minerals Google Search for Brianroulstonite
John Betts Fine Minerals Search for Brianroulstonite
McDougall Minerals Google Search for Brianroulstonite
Mineral News Website Link
Rock and Mineral Shows Google Search for Brianroulstonite
Weinrich Minerals, Inc. Google Search for Brianroulstonite

Ask about Brianroulstonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: