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Walkerite Mineral Data

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General Walkerite Information

Help on Chemical  Formula: Chemical Formula: Ca16(Mg,Li,[ ])2[B13O17(OH)12]4Cl6•28(H2O)
Help on Composition: Composition: Molecular Weight = 3,822.57 gm
   Potassium   0.06 %  K     0.07 % K2O
   Sodium      0.10 %  Na    0.13 % Na2O
   Lithium     0.06 %  Li    0.12 % Li2O
   Calcium    16.36 %  Ca   22.89 % CaO
   Magnesium   0.35 %  Mg    0.58 % MgO
   Iron        0.25 %  Fe    0.32 % FeO
   Boron      14.54 %  B    46.83 % B2O3
   Hydrogen    2.83 %  H    25.28 % H2O
   Chlorine    4.88 %  Cl    4.88 % Cl
                -   %   Cl   -1.10 % -O=Cl2   
   Oxygen     60.58 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca15.6Na0.16K0.06Mg0.55Li0.31Fe2+0.17B51.43O68(OH)48Cl5.26(OH)0.74H2.53�28(H2O)
Help on Environment: Environment: Upper Halite Member of the Windsor Group evaporites. Structure is similar to penobsquisite and pringleite.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Potash Corporation of Saskatchewan (New Brunswick Division) mine at Penobsquis, near Sussex, Kings County, New Brunswick, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Thomas Leonard Walker (1867-1942), Founding Member and past president Geological Society of America.
Help on Synonym: Synonym: IMA2001-051

Walkerite Image

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Comments: Scanning electron micrograph of an acicular walkerite crystal.
Location: Potash Corporation of Saskatchewan (New Brunswick Division) mine at Penobsquis, near Sussex, Kings County, New Brunswick, Canada. Scale: See Picture.
© Canadian Mineralogist

Walkerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6824:1:0.3852
Help on Cell Dimensions: Cell Dimensions: a = 15.52, b = 22.74, c = 8.761, Z = 1; V = 3,091.97 Den(Calc)= 2.05
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Pba2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.82(1)(110), 7.785(0.8)(200), 6.319(0.4)(121),2.57(0.3)(461,550), 3.17(0.3)(170), 5.649(0.3)(211), 2.413(0.2), 4.14(0.2), 6.8(0.2),

Physical Properties of Walkerite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.07
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Walkerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2605,KPDmeas= 0.258,KC= 0.2526
Ncalc = 1.52
Help on Optical Data: Optical Data: Biaxial (+), a=1.516, b=1.532, g=1.554, bire=0.0380, 2V(Calc)=82, 2V(Meas)=82.2. Dispersion dispersion not observed.

Calculated Properties of Walkerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.10 gm/cc
note: Specific Gravity of Walkerite =2.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEWalkerite = 2.61 barns/electron
U=PEWalkerite x relectron= 5.49 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 0.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Walkerite per GRapi unit =108.97 (%)

Estimated Radioactivity from Walkerite - barely detectable


Walkerite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.05)Dana Type
  (26.05.17)Pringleite Group Pringleite Ca9B26O34(OH)24Cl4•13(H2O) P1 1 Ruitenbergite Ca9B26O34(OH)24Cl4•13(H2O) P 21 2 Brianroulstonite! Ca3[B5O6(OH)6](OH)Cl2•8(H2O) Pa m Penobsquisite! Ca2Fe[B9O13(OH)6]Cl•4(H2O) P 21 2 Walkerite! Ca16(Mg,Li,[])2[B13O17(OH)12]4Cl6•28(H2O) Pba2 mm2
Help on  Strunz Class: Strunz Class: 06.GB.20 06 - BORATES
  06.G - Heptaborates and other Megaborates
  06.GB -Phyllo-nonborates, etc.
06.GB.20 Walkerite! Ca16(Mg,Li,[])2[B13O17(OH)12]4Cl6•28(H2O) Pba2 mm2

Other Walkerite Information

Help on References: References: NAME( CanMin, v 40, p 1675) PHYS. PROP.(CanMin, v 40, p 1675) OPTIC PROP.(CanMin, v 40, p 1675)
Help on See Also: See Also: Links to other databases for Walkerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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


Ca16(Mg,Li,[ ])2[B13O17(OH)12]4Cl6•28(H2O)
Dana No: Strunz No: 06.GB.20





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