Tokkoite  Mineral Data

Tokkoite Mineral Data

Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About


General Tokkoite Information

Help on Chemical  Formula: Chemical Formula: K2Ca4[Si7O18(OH)](F,OH)
Help on Composition: Composition: Molecular Weight = 758.60 gm
   Potassium  10.31 %  K    12.42 % K2O
   Calcium    21.13 %  Ca   29.57 % CaO
   Silicon    25.92 %  Si   55.44 % SiO2
   Hydrogen    0.17 %  H     1.48 % H2O
   Oxygen     40.60 %  O
   Fluorine    1.88 %  F     1.88 % F
                -   %   F    -0.79 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2Ca4Si7O18(OH)1.25F0.75
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: Murun massif, between the Charo and Tokko rivers, Yakutia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tokkoite Say TOKKOITE
Help on Synonym: Synonym: ICSD 67211
  PDF 40-517
 

Tokkoite Image

Click Here for Larger Tokkoite Image in a New Browser Window Images:
Click Here for Larger Tokkoite Image

Tokkoite   Charoite

Comments: Yellow crystalline tokkoite intermixed with purple charoite (viewed cross-sectional to fiber direction).
Location: Murun, Aldan, Republic of Sakha, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tokkoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8343:1:0.5684
Help on Cell Dimensions: Cell Dimensions: a = 10.438, b = 12.511, c = 7.112, Z = 2; alpha = 89.92°, beta = 99.75°, gamma = 92.89° V = 914.17 Den(Calc)= 2.76
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.5(1), 10.3(0.45), 5.2(0.42),
Click Here for Large Tokkoite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate

Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above


Rozhdestvenskaya I V , Nikishova L V , Lazebnik Yu D , Lazebnik K A , Zeitschrift fur Kristallographie , 189 (1989) p.195-204, The crystal structure of tokkoite and its relation to the structure of tinaksite, Locality: Murun massif, southwestern Yakutia, Russia, Note: anisotropic temperature factors taken from ICSD

 

Physical Properties of Tokkoite

Help on Cleavage: Cleavage: {010} Perfect, {110} Very Good
Help on Color: Color: Brownish yellow, Colorless, Light yellow.
Help on Density: Density: 2.76
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Tokkoite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2078,KPDmeas= 0.2078,KC= 0.2077
Ncalc = 1.57
Help on Optical Data: Optical Data: Biaxial (+), a=1.57, g=1.577, bire=0.0070, 2V(Meas)=38.
 

Calculated Properties of Tokkoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Tokkoite =2.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETokkoite = 4.62 barns/electron
U=PETokkoite x relectron= 12.72 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 148.20 (Gamma Ray American Petroleum Institute Units)
Concentration of Tokkoite per GRapi unit = 0.67 (%)

Estimated Radioactivity from Tokkoite - barely detectable

 

Tokkoite Classification

Help on  Dana Class: Dana Class: 67.02.01.02 (67)Inosilicate Unbranched Chains with W>2
  (67.02)with W=5
  (67.02.01)Tinaksite group
 
67.02.01.01 Tinaksite K2Na(Ca,Mn)2(Ti,Fe)O[Si7O18(OH)] P1,P 1 Tri
 
67.02.01.02 Tokkoite K2Ca4[Si7O18(OH)](F,OH) P1 1
 
67.02.01.03 Senekevichite! CsKNaCa2TiO[Si7O18(OH)] P1 1
Help on  Strunz Class: Strunz Class: 09.DG.75 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DG -Inosilicates with 3-periodic single and multiple chains
 
09.DG.75 Tokkoite K2Ca4[Si7O18(OH)](F,OH) P1 1
 
09.DG.75 Tinaksite K2Na(Ca,Mn)2(Ti,Fe)O[Si7O18(OH)] P1,P 1 Tri
 

Other Tokkoite Information

Help on References: References: NAME( Dana8) 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 Tokkoite :
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

Search for Tokkoite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Tokkoite :

A Bijoux Google Search for Tokkoite
Adam's Minerals Google Search for Tokkoite
Cape Minerals Google Search for Tokkoite
Dakota Matrix Minerals Google Search for Tokkoite
Excalibur Mineral Corp. Google Search for Tokkoite
Exceptional Minerals Google Search for Tokkoite
John Betts Fine Minerals Search for Tokkoite
McDougall Minerals Google Search for Tokkoite
Mineral News Website Link
Rock and Mineral Shows Google Search for Tokkoite
Weinrich Minerals, Inc. Google Search for Tokkoite

Ask about Tokkoite 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 Espaņol

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

Tokkoite

K2Ca4[Si7O18(OH)](F,OH)
Dana No: 67.02.01.02 Strunz No: 09.DG.75
Locality:

 

Notes: