Brianroulstonite Mineral Data

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.

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

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

Search for Brianroulstonite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Brianroulstonite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Brianroulstonite Mineral Data :

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: 26.5.17.3 Strunz No: V/K.09-05
Locality:

Notes: