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Volkovskite

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About VolkovskiteHide

Formula:
KCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O
Colour:
Colourless, pink; varying from pale to deep orange
Lustre:
Vitreous
Hardness:
Crystal System:
Triclinic
Name:
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

Approved
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

Physical Properties of VolkovskiteHide

Vitreous
Transparency:
Translucent
Colour:
Colourless, pink; varying from pale to deep orange
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
{010} and {100}

Optical Data of VolkovskiteHide

Type:
Biaxial (+)
RI values:
nα = 1.523 - 1.539 nβ = 1.539 - 1.540 nγ = 1.596 - 1.605
2V:
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:
Low
Dispersion:
No dispersion

Chemical Properties of VolkovskiteHide

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

Crystallography of VolkovskiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 6.57 Å, b = 23.92 Å, c = 6.52 Å
α = 90.58°, β = 119.1°, γ = 95.56°
Ratio:
a:b:c = 0.275 : 1 : 0.273
Unit Cell V:
889.16 ų (Calculated from Unit Cell)
Morphology:
The crystals possess perfect cleavages occurring as thinly layered pseudohexagonal/triangular, elongated platy masses.

Type Occurrence of VolkovskiteHide

Other Language Names for VolkovskiteHide

German:Volkovskit
Simplified Chinese:沃硼钙石
Spanish:Volkovskita
Traditional Chinese:沃硼钙石

Common AssociatesHide

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

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.30HeidorniteNa2Ca3B5O8(SO4)2Cl(OH)2Mon.
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.
10.1.4FluoboriteMg3(BO3)(F,OH)3Hex.
10.1.5BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
10.1.6KarliteMg7(BO3)3(OH,Cl)5Orth.
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
10.1.8/9/10HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
10.1.11SolongoiteCa2(H3B3O7)(OH)ClMon.
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
10.1.20EricaiteFe2+3(B7O13)ClOrth.

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.
Canada
 
  • 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
Russia
 
  • 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.
UK
 
  • England
    • North Yorkshire
      • Redcar and Cleveland
        • Loftus
Rob lavinsky
USA
 
  • Alabama
    • Clarke Co.
Rocks & Min.: 64:472.
Mineral and/or Locality  
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