Mineralogy Database

Volkonskoite Mineral Data

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General Volkonskoite Information

Help on Chemical  Formula: Chemical Formula: Ca0.3(Cr+++,Mg,Fe+++)2(Si,Al)4O10(OH)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 475.69 gm
   Calcium     0.84 %  Ca    1.18 % CaO
   Magnesium   4.60 %  Mg    7.63 % MgO
   Aluminum    2.84 %  Al    5.36 % Al2O3
   Chromium   13.12 %  Cr   19.17 % Cr2O3
   Iron        3.52 %  Fe    5.04 % Fe2O3
   Silicon    20.66 %  Si   44.21 % SiO2
   Hydrogen    1.95 %  H    17.42 % H2O
   Oxygen     52.47 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.1Mg0.1Cr1.2Mg0.8Fe3+0.3Si3.5Al0.5O10(OH)2�3.6(H2O)
Help on Environment: Environment: Epignetic mineral in sandstones, conglomerates, and red beds, commonly filling voids from the decomposition of organic material.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1830
Help on Locality: Locality: Mt. Efimiatsk and elsewhere in the Okhansk region, Middle Kama River area, Perm Basin, Ural Mountians, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Prince A. Volkonskoi, Minister of the Imperial Court, Russia.
Help on Name Pronunciation: Name Pronunciation: Volkonskoite + Pronunciation Say VOLKONSKOITE
Help on Synonym: Synonym: Volchonskoite

Volkonskoite Image

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Comments: Specimen of massive, green volkonskoite.
Location: Efimyatskaja Perm, Ural Mts., Russia. Scale: 1.1 x 1 cm.
© John Veevaert

Volkonskoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5771:1:1.6107
Help on Cell Dimensions: Cell Dimensions: a = 5.16, b = 8.94, c = 14.4, Z = 2; beta = 90° V = 664.28 Den(Calc)= 2.38
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

Physical Properties of Volkonskoite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Yellow, Olive green, Bright green.
Help on Density: Density: 2 - 2.5, Average = 2.25
Help on Diaphaneity: Diaphaneity: Subopaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Resinous
Help on Streak: Streak: blue green

Optical Properties of Volkonskoite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2365,KPDmeas= 0.2501,KC= 0.2515
Ncalc = 1.5 - 1.63
Help on Optical Data: Optical Data: Biaxial (-), a=1.551-1.56, b=1.564, g=1.569, bire=0.0090-0.0180, 2V(Calc)=62-84, 2V(Meas)=small.

Calculated Properties of Volkonskoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Volkonskoite =2.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEVolkonskoite = 4.99 barns/electron
U=PEVolkonskoite x rElectron Density= 11.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Volkonskoite is Not Radioactive

Volkonskoite Classification

Help on  Dana Class: Dana Class: 71.03.01a.04 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.03)with 2:1 clays
  (71.03.01a)Smectite group (Dioctahedral Smectites)
71.03.01a.01 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O) C 2/m or ORTH 2/m
71.03.01a.02 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2•n(H2O) C 2/m 2/m
71.03.01a.03 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2•n(H2O) C 2/m 2/m
71.03.01a.04 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
71.03.01a.05 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O) C 2/m (MON or ORTH) 2/m
Help on  Strunz Class: Strunz Class: 09.EC.40 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.40 Almbosite? Fe5Fe4V4Si3O27 Ortho ? Ortho
09.EC.40 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O) C 2/m or ORTH 2/m
09.EC.40 Kurumsakite (Zn,Ni,Cu)8Al8V2Si5O35•27(H2O)(?) Unk Ortho
09.EC.40 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2•n(H2O) C 2/m 2/m
09.EC.40 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2•n(H2O) C 2/m 2/m
09.EC.40 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
09.EC.40 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2•3(H2O) C 2/m 2/m

Other Volkonskoite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Volkonskoite :
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

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Dana No: 71.03.01a.04 Strunz No: 09.EC.40





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