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About VolkovskiteHide

KCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O
Colourless, pink; varying from pale to deep orange
Crystal System:
Named after A.I. Volkovskaya, Russian petrographer.

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.

Classification of VolkovskiteHide


E : Pentaborates
C : Phyllo-pentaborates

5 : Pentaborates

10 : Borates with other anions
1 : Borates with halide

Physical Properties of VolkovskiteHide

Colourless, pink; varying from pale to deep orange
2½ on Mohs scale
{010} and {100}

Optical Data of VolkovskiteHide

Biaxial (+)
RI values:
nα = 1.523 - 1.539 nβ = 1.539 - 1.540 nγ = 1.596 - 1.605
Measured: 14.6° , Calculated: 14.4°
Max Birefringence:
δ = 0.073
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
No dispersion

Chemical Properties of VolkovskiteHide

KCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O
IMA Formula:
KCa4B22O32(OH)10Cl · 4H2O

Crystallography of VolkovskiteHide

Crystal System:
Class (H-M):
1 - Pedial
Space Group:
Cell Parameters:
a = 6.57 Å, b = 23.92 Å, c = 6.52 Å
α = 90.58°, β = 119.1°, γ = 95.56°
a:b:c = 0.275 : 1 : 0.273
Unit Cell V:
889.16 ų (Calculated from Unit Cell)
The crystals possess perfect cleavages occurring as thinly layered pseudohexagonal/triangular, elongated platy masses.

Type Occurrence of VolkovskiteHide

Other Language Names for VolkovskiteHide

Simplified Chinese:沃硼钙石
Traditional Chinese:沃硼钙石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hilgardite9 photos of Volkovskite associated with Hilgardite on

Related Minerals - Nickel-Strunz GroupingHide

6.EC.05BiringucciteNa2B5O8(OH) · H2OMon.
6.EC.05NasiniteNa2[B5O8(OH)] · 2H2OOrth.
6.EC.10GoweriteCa[B5O8(OH)][B(OH)3] · 3H2OMon.
6.EC.15P-VeatchiteSr2B11O16(OH)5 · H2O
6.EC.15VeatchiteSr2B11O16(OH)5 · H2OMon. m : Bb
6.EC.25TuzlaiteNaCaB5O8(OH)2 · 3H2OMon. 2/m : P21/b
6.EC.35BrianroulstoniteCa3[B5O6(OH)6](OH)Cl2 · 8H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.1.1TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.2BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.3BerboriteBe2(BO3)(OH,F) · H2OTrig.
10.1.5BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
10.1.8/9/10HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
10.1.12HydrochlorboriteCa4B8O15Cl2 · 21H2OMon.
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2OHex.
10.1.15ChelkariteCaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1Orth.
10.1.16JohachidoliteCaAlB3O7Orth. mmm (2/m 2/m 2/m) : Cmma
10.1.17SatimoliteKNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2OTrig. 3m (3 2/m) : R3m
10.1.18ChambersiteMn2+3(B7O13)ClOrth. mm2 : Pca21
10.1.19Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c

Other InformationHide

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
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 VolkovskiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kondrat’eva, V.V., Ostrovskaya, I.V. & YarzhemskiiI, YA. (1966): Volkovskite, a new hydrous calcium borate. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 95, 45-50 (in Russian).
Mandarino, J.A., Rachlin, A.L., Dunn, P.J., Le Page, Y., Back, M.E., Murowchick, B.L., Ramik, R.A. & Falls, R.B. (1990): Redefinition of volkovskite and its description from Sussex, New Brunswick. Canadian Mineralogist. 28, 351-356.
Rastsvetaeva, R.K., Andrianov, V.I., Gernkina, E.A., Sokolova, T.N. & Kasbaev, A.A. (1992): Crystal structure of volkovskite. Kristallografiya 37, 326-333 (in Russ.).
Grice et al. (1999): Canadian Mineralogist 37, 731-762.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Poulin, R. S. and Grice, J. D. (2013): Volkovskite, a complex borate mineral: Refined crystallographic data and optics. Can. Mineral. 51, 157-169.
Chukanov, N.V. (2014): Infrared spectra of mineral species: Extended library. Springer (Springer Geochemistry/Mineralogy), vol. 1, Dordrecht, 1726 pp.

Internet Links for VolkovskiteHide

Localities for VolkovskiteHide

ⓘ - 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.
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
        • Penobsquis
Canadian Mineralogist (2002): 40(6): 1675-1686.
      • Hammond Parish
        • Salt Springs evaporite deposit
MANDARINO, J.A., RACHLIN, A.L., DUNN, P.J., LE PAGE, Y., BACK, M.E., MUROWCHICK, B.L., RAMIK, R.A. & FALLS, R.B. (1990): Redefinition of volkovskite and its description from Sussex, New Brunswick. Canadian Mineralogist 28, 351-356.
      • Studholm Parish
Grice, J.D., Gault, R.A., Van Velthuizen, J. (2005) Borate minerals of the Penobsquis and Millstream deposits, southern New Brunswick, Canada. The Canadian Mineralogist: 43: 1469-1487.
Kazakhstan (TL)
  • Atyrau
    • Atyrau (Gur'yev)
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30; Pekov, I. V. & Abramov, D. V. (1993): Boron deposit of the Inder and its minerals. World of Stones, 1, 23-30.
  • West Kazakhstan
    • Oral Rayon (Uralsk Rayon)
Tony Nikischer specimen
  • Irkutsk Oblast
    • Lower Tunguska
      • Nepa River basin
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Saudi Arabia
  • Mintaqah Al Madinah
Faheha, A. A., Hamidalddin, S. Q., Al-Turkestany, N. A., & Ibraheim, N. M. (2012). Concentrations Of Natural And Man-Made Radioactivity Of Surface Soil In Al-Madinh Al-Monawarah, Western Province of Saudi Arabia. Isotope and Radiation Research, 44(2), 495-504.
  • England
    • North Yorkshire
      • Redcar and Cleveland
        • Loftus
Rob lavinsky
  • Alabama
    • Clarke Co.
Rocks & Min.: 64:472.
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