Walkerite Mineral Data

Walkerite Mineral Data

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General Walkerite Information

Chemical Formula:

Ca16(Mg,Li,[ ])2[B13O17(OH)12]4Cl6·28(H2O)

Composition:

Molecular Weight = 3,822.48 gm

Potassium 0.10 % K 0.12 % K₂O

Sodium 0.12 % Na 0.16 % Na₂O

Lithium 0.05 % Li 0.12 % Li₂O

Calcium 16.36 % Ca 22.89 % CaO

Magnesium 0.32 % Mg 0.53 % MgO

Iron 0.29 % Fe 0.38 % FeO

Boron 14.51 % B 46.72 % B₂O₃

Hydrogen 2.77 % H 24.73 % H₂O

Chlorine 4.92 % Cl 4.92 % Cl

- % Cl -1.11 % -O=Cl₂

Oxygen 60.57 % O

______ ______

100.00 % 99.45 % = TOTAL OXIDE

Empirical Formula:

Ca_15.6Na_0.2K_0.1Mg_0.5Li_0.3Fe²⁺_0.2B_51.3O₆₈(OH)_48.7Cl_5.3H_0.2528(H₂O)

Environment:

Upper Halite Member of the Windsor Group evaporites. Structure is similar to penobsquisite and pringleite.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Potash Corporation of Saskatchewan (New Brunswick Division) mine at Penobsquis, near Sussex, Kings County, New Brunswick, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Thomas Leonard Walker (1867-1942), Founding Member and past president Geological Society of America.

Synonym:

IMA2001-051

Walkerite Image

Images:

Walkerite

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

Axial Ratios:

a:b:c =0.6824:1:0.3852

Cell Dimensions:

a = 15.52, b = 22.74, c = 8.761, Z = 1; V = 3,091.97 Den(Calc)= 2.05

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pba2

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

By Intensity(I/I_o): 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),

Crystal Structure:

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Grice J D , Gault R A , Van Velthuizen J , Pratt A , The Canadian Mineralogist , 40 (2002) p.1675-1686, Walkerite, a new borate mineral species in an evaporitic sequence from, Sussex, New Brunswick, Canada, Locality: Sussex, New Brunswick, Canada

Physical Properties of Walkerite

Cleavage:

None

Color:

Colorless, White.

Density:

2.07

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Walkerite

Gladstone-Dale:

CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2605,KPDmeas= 0.258,KC= 0.2508

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

Electron Density:

r_electron=2.10 gm/cc
note: r_Walkerite=2.07 gm/cc.

Fermion Index

Fermion Index = 0.0298
Boson Index = 0.9702

Photoelectric:

PE_Walkerite= 2.63 barns/electron
U=PE_Walkerite x r_electron= 5.53 barns/cc.

Radioactivity:

GRapi = 1.50 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Walkerite - barely detectable

Walkerite Classification

Dana Class:

26.5.17.5 (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.09-25 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 Walkerite Information

References:

NAME( CanMin, v 40, p 1675) PHYS. PROP.(CanMin, v 40, p 1675) OPTIC PROP.(CanMin, v 40, p 1675)

See Also:

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

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

Walkerite

Ca16(Mg,Li,[ ])2[B13O17(OH)12]4Cl6·28(H2O)
Dana No: 26.5.17.5 Strunz No: V/K.09-25
Locality:

Notes: