Tokkoite Mineral Data + Say TOKKOITE


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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 Synonym: Synonym: ICSD 67211
  PDF 40-517
 

Tokkoite Image

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

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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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.75 gm/cc
note: rTokkoite =2.76 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01259
Boson Index = 0.98741
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)

Estimated Radioactivity from Tokkoite - barely detectable

 

Tokkoite Classification

Help on  Dana Class: Dana Class: 67.2.1.2 (67)Inosilicate Unbranched Chains with W>2
  (67.2)with W=5
  (67.2.1)Tinaksite group
 
67.2.1.1 Tinaksite K2Na(Ca,Mn)2(Ti,Fe)O[Si7O18(OH)] P1,P 1 Tri
 
67.2.1.2 Tokkoite K2Ca4[Si7O18(OH)](F,OH) P1 1
 
67.2.1.3 Senekevichite! CsKNaCa2TiO[Si7O18(OH)] P1 1
Help on  Strunz Class: Strunz Class: VIII/F.22-20 VIII - Silicates
  VIII/F - Inosilicates (chain and band) Triplet chains [Si6O15/17]6-/10- and modified triplet bands
  VIII/F.22 - Zorite - Tinaksite series
 
VIII/F.22-10 Zorite Na6Ti5[Si12O34](O,OH)5·11(H2O) C mmm 2/m 2/m 2/m
 
VIII/F.22-15 Haineaultite! (Na,Ca)5Ca(Ti,Nb)5(Si,S)12O34(OH,F)8·5(H2O) C 222 2 2 2
 
VIII/F.22-20 Tokkoite K2Ca4[Si7O18(OH)](F,OH) P1 1
 
VIII/F.22-30 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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

Tokkoite

K2Ca4[Si7O18(OH)](F,OH)
Dana No: 67.2.1.2 Strunz No: VIII/F.22-20
Locality:

 

Notes:

 

 
   
 
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