Volkovskite Mineral Data

Volkovskite Mineral Data
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General Volkovskite Information

Help on Chemical Formula: Chemical Formula: KCa4[B5O8(OH)4][B(OH)3]Cl•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: KCa4B6O8(OH)7Cl•4(H2O)
Help on Environment: Environment: Found in water-insoluble residues from salt domes and potash deposits.
Help on IMA Status: IMA Status: Approved IMA 1966
Help on Locality: Locality: Inder borate deposit, Kazakhstan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for A.I. Volkovskaya, petrographer, who first noted the mineral.
Help on Synonym: Synonym: ICSD 39637
  PDF 18-1460
 

Volkovskite Image

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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
Help on Axial Ratios: Axial Ratios: a:b:c =0.2748:1:0.2724
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - PedialH-M Symbol (1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.26(1), 7.91(0.9), 11.89(0.7),
Click Here for Large Volkovskite Structure Window Crystal Structure:

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Rastsvetaeva R K , Andrianov V I , Genkina E A , Sokolova T N , Kashaev A A , Kristallografiya , 37 (1992) p.326-333, Crystal structure of volkovskite KCa4B22O32(OH)10Cl·4H2O from Nepkii deposit (E. Siberia), Locality: Eastern Siberia

 

Physical Properties of Volkovskite

Help on Cleavage: Cleavage: {010} Perfect, {001} Good
Help on Color: Color: Colorless, Light orange, Pink.
Help on Density: Density: 2.27 - 2.34, Average = 2.3
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Volkovskite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.06 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.24,KPDmeas= 0.2406,KC= 0.2559
Ncalc = 1.58 - 1.6
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Volkovskite =2.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEVolkovskite = 4.28 barns/electron
U=PEVolkovskite x relectron= 9.99 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 92.20 (Gamma Ray American Petroleum Institute Units)
Concentration of Volkovskite per GRapi unit = 1.08 (%)

Estimated Radioactivity from Volkovskite - barely detectable

 

Volkovskite Classification
Help on Dana Class: Dana Class: 26.05.16.01 (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.05)Dana Type
  (26.05.16)Dana Group
 
26.05.16.01 Volkovskite KCa4[B5O8(OH)4][B(OH)3]Cl•4(H2O) P1 1
Help on Strunz Class: Strunz Class: 06.EC.20 06 - BORATES
  06.E - Pentaborates
  06.EC -Phyllo-pentaborates
 
06.EC.20 Volkovskite KCa4[B5O8(OH)4][B(OH)3]Cl•4(H2O) P1 1
 

Other Volkovskite Information
Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Volkovskite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Volkovskite

KCa4[B5O8(OH)4][B(OH)3]Cl•4(H2O)
Dana No: 26.05.16.01 Strunz No: 06.EC.20
Locality:

 

Notes: