Volkovskite (original) (raw)

A valid IMA mineral species

About VolkovskiteHide

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Formula:

KCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O

Colour:

Colourless, pink; varying from pale to deep orange

Name:

Named in honor of A.I. Volkovskaya (А.И. Волковской), Russian petrographer who first found the mineral in water insoluble residues from drill cores.

Volkovskite was first described from Kazakhstan [TL1] by Kondrat’eva et al. (1966), and redefined by Mandarino et al. (1990) from the Salt Spring deposit [TL2]. The redefinition established the triclinic symmetry and presence of K and Cl as essential constituents in the mineral.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:4202:0

08eb4d8d-005e-4141-b6b9-71f77567879b

IMA Classification of VolkovskiteHide

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IMA Formula:

KCa4B22O32(OH)10Cl · 4H2O

Type description reference:

Classification of VolkovskiteHide

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6.EC.20

6 : BORATES
E : Pentaborates
C : Phyllo-pentaborates

26.5.16.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates

10.1.14

10 : Borates with other anions
1 : Borates with halide

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 VolkovskiteHide

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Colour:

Colourless, pink; varying from pale to deep orange

Cleavage:

Perfect
{010} and {100}

Density:

2.27(3) g/cm3 (Measured) 2.28 g/cm3 (Calculated)

Optical Data of VolkovskiteHide

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RI values:

_n_α = 1.523 - 1.539 _n_β = 1.539 - 1.540 _n_γ = 1.596 - 1.605

2V:

Measured: 14.6° , Calculated: 14.4°

δ = 0.073

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

Optical Extinction:

Y = b; Z ∧ a = 31°.

Chemistry of VolkovskiteHide

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Mindat Formula:

KCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O

Crystallography of VolkovskiteHide

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Cell Parameters:

a = 6.575(2) Å, b = 23.921(8) Å, c = 6.522(2) Å
α = 90.58(3)°, β = 119.10(2)°, γ = 95.56(3)°

Ratio:

a:b:c = 0.275 : 1 : 0.273

Unit Cell V:

890.15 ų (Calculated from Unit Cell)

Morphology:

The crystals possess perfect cleavages occurring as thinly layered pseudohexagonal/triangular, elongated platy masses.

New Brunswick material: Pseudohexagonal, platy crystals tabular on {010}. Forms identified: {010}, {010}, {001}, {001}, {281}, {281} and {181}.

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Inder deposit, Kazakhstan. Data from the type description.

Geological EnvironmentHide

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Type Occurrence of VolkovskiteHide

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General Appearance of Type Material:

Pseudohexagonal to triangular crystals and micaceous plates, to 1 cm.

Place of Conservation of Type Material:

A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia; Royal Ontario Museum, Toronto, Canada, M44196.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Kondrat’eva, V.V., Ostrovskaya, I.V. & YarzhemskiiI, YA. (1966): Volkovskite, a new hydrous calcium borate. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 95, 45-50

Other Language Names for VolkovskiteHide

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Simplified Chinese:沃硼钙石

Traditional Chinese:沃硼钙石

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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IR Spectrum:

Satimola dome material [cm-1]: 3400, 3300, 3175, 3020, 1685s, 1640w, 1510, 1410s, 1386s, 1366s, 1338s, 1266s, 1250sh, 1215w, 1175sh, 1156, 1137, 1099, 1068, 1015s, 982s, 936s, 903s, 840, 812, 763, 704, 626, 610, 572w, 548w, 494w, 475w.

Notes:

Insoluble in water at room temperature.

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 VolkovskiteHide

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References for VolkovskiteHide

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Reference List:

Mandarino, Jospeh A., Rachlin, Alan L., Dunn, Pete, J., Le Page, Yvon, Back, Malcolm E., Murowchick, Bernard L., Ramik, Robert A., Falls, Robert B. (1990) Redefinition of volkovskite and its description from Sussex, New Brunswick. The Canadian Mineralogist, 28 (2) 351-356

Genis, Jac, Freier, Max D., Green, David I., Cotterell, Tom F. (2016) Exceptional Volkovskite Crystals from Zechstein Evaporites at the Boulby Mine, Cleveland, England. Rocks & Minerals, 91 (5) 434-443 doi:10.1080/00357529.2016.1193698

Localities for VolkovskiteHide

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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.