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Walkerite

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About WalkeriteHide

Thomas Leonard Walker
Formula:
Ca16(Mg,Li,◻)2[B13O17(OH)12]4Cl6·28H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.07
Crystal System:
Orthorhombic
Name:
The name honors Thomas Leonard Walker (31 December 1867, Brampton, Ontario, Canada - 6 August 1942, Toronto, Ontario, Canada), Professor and Head of Mineralogy and Petrography, University of Toronto (1901-1937), for his contributions to mineralogy in general and to the studies of the New Brunswick borate deposits in particular. Before his academic career at University of Toronto, Walker was Assistant Director of the Geological Survey of India (1897-1901) and lecturer of the University of Calcutta. He was also the Director of the Department of Mineralogy, Royal Ontario Museum (1913-1942), and the founder in 1921, of Contributions to Canadian Mineralogy, University of Toronto Studies, the predecessor of The Canadian Mineralogist.
This page provides mineralogical data about Walkerite.


Classification of WalkeriteHide

Approved
First Published:
2002
6.GB.20

6 : BORATES
G : Heptaborates and other megaborates
B : Phyllo-nonborates, etc.

Physical Properties of WalkeriteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless
Hardness:
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Splintery
Density:
2.07 g/cm3 (Measured)    

Optical Data of WalkeriteHide

Type:
Biaxial (+)
RI values:
nα = 1.516 nβ = 1.532 nγ = 1.554
2V:
Measured: 82° (3), Calculated: 82°
Max Birefringence:
δ = 0.038
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
None
Pleochroism:
Non-pleochroic

Chemical Properties of WalkeriteHide

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

Crystallography of WalkeriteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pba2
Cell Parameters:
a = 15.52 Å, b = 22.74 Å, c = 8.76 Å
Ratio:
a:b:c = 0.682 : 1 : 0.385
Unit Cell V:
3,091.62 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Fibrous to bladed crystals to 2mm and bundles to 7 mm. Elongate on [001] with pinacoids {100} and {010} and pedion {001}.
Twinning:
None observed.

Type Occurrence of WalkeriteHide

General Appearance of Type Material:
Fibrous crystals found as residue from dissolving halite drill cores.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, CMNMC 83379 and CMNMC
83380.
Geological Setting of Type Material:
Halite member of an evaorite sequence of rocks, near a potash deposit.
Associated Minerals at Type Locality:

Synonyms of WalkeriteHide

Other Language Names for WalkeriteHide

German:Walkerit
Simplified Chinese:沃水氯硼钙石
Traditional Chinese:沃水氯硼鈣石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Halite1 photo of Walkerite associated with Halite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.GB.05StudenitsiteNaCa2[B9O14(OH)4] · 2H2OMon.
6.GB.10PenobsquisiteCa2Fe2+[Cl|B9O13(OH)6]Cl · 4H2OMon.
6.GB.15PreobrazhenskiteMg3B11O15(OH)9Orth.

Fluorescence of WalkeriteHide

No fluorescence with either short-wave or long-wave ultraviolet light.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for WalkeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grice, J.D., Galt, R.A., Van Velthuizen, J., Pratt, A. (2002) Walkerite, a new borate mineral species inan evaporitic sequence from Sussex, New Brunswick, Canada. Canadian Mineralogist: 40: 1675-1686.
Jambor, J.L., Roberts, A.C. (2003) New mineral names. American Mineralogist: 88: 1836-1840.
Grice, J.D., Gault, R.A., Van Velthuizen, J.J. (2005) Borate minerals from the Penobsquis and Millstream deposits, Southern New Brunswick, Canada. Canadian Mineralogist: 43: 1469-1487.

Internet Links for WalkeriteHide

Localities for WalkeriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
 
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
        • Penobsquis
GRICE, J.D., GAULT, R.A., VAN VELTHUIZEN, J. & PRATT, A. (2002) Walkerite: a new borate mineral species in an evaporitic sequence from Sussex, New Brunswick. Canadian Mineralogist 40, 1675-1685.
Mineral and/or Locality  
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