Volkovskite Mineral Data

Volkovskite Mineral Data

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General Volkovskite Information

Chemical Formula:

KCa4[B5O8(OH)4][B(OH)3]Cl·4(H2O)

Composition:

Molecular Weight = 618.83 gm

Potassium 6.32 % K 7.61 % K₂O

Calcium 25.91 % Ca 36.25 % CaO

Boron 10.48 % B 33.75 % B₂O₃

Hydrogen 2.44 % H 21.83 % H₂O

Chlorine 5.73 % Cl 5.73 % Cl

- % Cl -1.29 % -O=Cl₂

Oxygen 49.12 % O

______ ______

100.00 % 103.88 % = TOTAL OXIDE

Empirical Formula:

KCa₄B₆O₈(OH)₇Cl·4(H₂O)

IMA Status:

Approved IMA 1966

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 39637

PDF 18-1460

Volkovskite Image

Images:

Volkovskite

Comments: Transparent colorless platy volkovskite cleavage.
Location: Nepskoye Deposit, Irkutsk Distict, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Volkovskite Crystallography

Axial Ratios:

a:b:c =0.2748:1:0.2724

Cell Dimensions:

a = 6.58, b = 23.937, c = 6.521, Z = 2; alpha = 90.4°, beta = 119.09°, gamma = 95.67° V = 893.12 Den(Calc)= 2.30

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.26(1), 7.91(0.9), 11.89(0.7),

Physical Properties of Volkovskite

Cleavage:

[010] Perfect, [001] Good

Color:

Colorless, Light orange, Pink.

Density:

2.27 - 2.34, Average = 2.3

Diaphaniety:

Transparent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Volkovskite

Gladstone-Dale:

CI meas= 0.06 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.058 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2411,KPDmeas= 0.2406,KC= 0.2559

Optical Data:

Biaxial (+), a=1.523-1.536, b=1.53-1.539, g=1.596-1.603, bire=0.0670-0.0730, 2V(Calc)=26-38, 2V(Meas)=24-37.

Calculated Properties of Volkovskite

Electron Density:

r_electron=2.33 gm/cc
note: r_Volkovskite=2.30 gm/cc.

Fermion Index

Fermion Index = 0.02145
Boson Index = 0.97855

Photoelectric:

PE_Volkovskite= 4.28 barns/electron
U=PE_Volkovskite x r_electron= 9.97 barns/cc.

Radioactivity:

GRapi = 92.20 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Volkovskite - barely detectable

Volkovskite Classification

Dana Class:

26.5.16.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.5)Dana Type

(26.5.16)Dana Group

26.5.16.1 Volkovskite KCa4[B5O8(OH)4][B(OH)3]Cl·4(H2O) P1 1

Strunz Class:

V/K.05-10 V - Nitrates, Carbonates and Borates

V/K - Layered borates with complex groups [Bx(O,OH)y]

V/K.05 - Volkovskite - Veatchite-A series

V/K.05-10 Volkovskite KCa4[B5O8(OH)4][B(OH)3]Cl·4(H2O) P1 1

V/K.05-20 Gowerite CaB6O10·5(H2O) P 2₁/n,P 2₁/a 2/m

V/K.05-30 Veatchite Sr2B11O16(OH)5·(H2O) Aa m

V/K.05-40 Veatchite-p! Sr2B11O16(OH)5·(H2O) P 2₁ 2

V/K.05-50 Veatchite-A Sr2B11O16(OH)5·(H2O) A1,A1 Tri

Other Volkovskite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Volkovskite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Volkovskite Specimen Label here :

Volkovskite

KCa4[B5O8(OH)4][B(OH)3]Cl·4(H2O)
Dana No: 26.5.16.1 Strunz No: V/K.05-10
Locality:

Notes: