Walkerite (original) (raw)

A valid IMA mineral species

About WalkeriteHide

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Formula:

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

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:29154:7

c6ccd05f-2d41-45f1-9de5-42f6ea502248

IMA Classification of WalkeriteHide

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IMA Formula:

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

Type description reference:

Grice, Joel D., Gault, Robert A., Van Velthuizen, Jerry, Pratt, Allen (2002) Walkerite, a new borate mineral species in an evaporitic sequence from Sussex, New Brunswick, Canada. The Canadian Mineralogist, 40 (6) 1675-1686 doi:10.2113/gscanmin.40.6.1675

Classification of WalkeriteHide

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6.GB.20

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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of WalkeriteHide

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Transparency:

Transparent, Translucent

Density:

2.07 g/cm3 (Measured) 2.05 g/cm3 (Calculated)

Optical Data of WalkeriteHide

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RI values:

_n_α = 1.516 _n_β = 1.532 _n_γ = 1.554

2V:

Measured: 82° (3), Calculated: 82°

δ = 0.038

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Pleochroism:

Non-pleochroic

Chemistry of WalkeriteHide

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Mindat Formula:

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

Crystallography of WalkeriteHide

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Crystal System:

Orthorhombic

Class (H-M):

m _m_2 - Pyramidal

Cell Parameters:

a = 15.52(1) Å, b = 22.74(1) Å, c = 8.76(4) Å

Ratio:

a:b:c = 0.682 : 1 : 0.385

Unit Cell V:

3,091.62 ų (Calculated from Unit Cell)

Morphology:

Fibrous to bladed crystals to 2mm and bundles to 7 mm. Elongate on [001] with pinacoids {100} and {010} and pedion {001}.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0005800	Walkerite	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, Canada The Canadian Mineralogist 40 1675-1686		2002	Sussex, New Brunswick, Canada	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of WalkeriteHide

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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:

Reference:

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.

Synonyms of WalkeriteHide

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Other Language Names for WalkeriteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of WalkeriteHide

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

Other InformationHide

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Health Risks:

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

Internet Links for WalkeriteHide

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References for WalkeriteHide

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Reference List:

Grice, Joel D., Gault, Robert A., Van Velthuizen, Jerry, Pratt, Allen (2002) Walkerite, a new borate mineral species in an evaporitic sequence from Sussex, New Brunswick, Canada. The Canadian Mineralogist, 40 (6) 1675-1686 doi:10.2113/gscanmin.40.6.1675

Localities for WalkeriteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.