Volkonskoite Mineral Data

[About Us] [Products] [Fluorescent Mineals] [Contact Us]
UVTools is a supplier of affordable ultraviolet lamps and fluorescent minerals
Our customers include mineral dealers, gift shops, and museums worldwide
We provide an array of shortwave, midwave, and longwave lamps at the best price!

General Volkonskoite Information

Chemical Formula:

Ca0.3(Cr+++,Mg,Fe+++)2(Si,Al)4O10(OH)2•4(H2O)

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

Empirical Formula:

Ca_0.1Mg_0.1Cr_1.2Mg_0.8Fe³⁺_0.3Si_3.5Al_0.5O₁₀(OH)₂·3.6(H₂O)

Environment:

Epignetic mineral in sandstones, conglomerates, and red beds, commonly filling voids from the decomposition of organic material.

IMA Status:

Valid Species (Pre-IMA) 1830

Locality:

Mt. Efimiatsk and elsewhere in the Okhansk region, Middle Kama River area, Perm Basin, Ural Mountians, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Prince A. Volkonskoi, Minister of the Imperial Court, Russia.

Name Pronunciation:

Volkonskoite + Pronunciation

Synonym:

Volchonskoite

Wolchonskoite

Volkonskoite Image

Images:

Volkonskoite

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

Volkonskoite Crystallography

Axial Ratios:

a:b:c =0.5771:1:1.6107

Cell Dimensions:

a = 5.16, b = 8.94, c = 14.4, Z = 2; beta = 90° V = 664.28 Den(Calc)= 2.38

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

Physical Properties of Volkonskoite

Cleavage:

{001} Perfect

Color:

Yellow, Olive green, Bright green.

Density:

2 - 2.5, Average = 2.25

Diaphaneity:

Subopaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Scaly - Morphology like fish scales.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Resinous

Streak:

blue green

Optical Properties of Volkonskoite

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

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

Electron Density:

Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Volkonskoite =2.25 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Volkonskoite= 4.99 barns/electron
U=PE_Volkonskoite x rElectron Density= 11.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Volkonskoite is Not Radioactive

Volkonskoite Classification

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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

Search for Volkonskoite using:

[ALTAVISTA] [AOL] [bing] [GeoScienceWorld] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Volkonskoite :

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Lapis Mineral Journal

Mineral News

UV Tools

Wrights Rock Shop

Translate Volkonskoite Mineral Data :

Ask about Volkonskoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Volkonskoite

Ca0.3(Cr+++,Mg,Fe+++)2(Si,Al)4O10(OH)2•4(H2O)
Dana No: 71.03.01a.04 Strunz No: 09.EC.40
Locality:

Notes: