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Tinaksite Mineral Data

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General Tinaksite Information

Help on Chemical  Formula: Chemical Formula: K2Na(Ca,Mn++)2(Ti,Fe)O[Si7O18(OH)]
Help on Composition: Composition: Molecular Weight = 751.73 gm
   Potassium  10.40 %  K    12.53 % K2O
   Sodium      3.06 %  Na    4.12 % Na2O
   Calcium     9.33 %  Ca   13.05 % CaO
   Titanium    5.41 %  Ti    9.03 % TiO2
   Manganese   1.83 %  Mn    2.36 % MnO
   Iron        1.11 %  Fe    1.43 % FeO
   Silicon    26.15 %  Si   55.95 % SiO2
   Hydrogen    0.13 %  H     1.20 % H2O
   Oxygen     42.57 %  O
             ______        ______ 
             100.00 %       99.68 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2NaCa1.75Mn2+0.25Ti0.85Fe2+0.15Si7O19(OH)
Help on Environment: Environment: K-feldspar metasomatites in contact with limestone.
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Murun alkalic massif, near Olekminsk, Yakutia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named fro the symbols of some of its component elements (Ti, Na, K).
Help on Name Pronunciation: Name Pronunciation: Tinaksite + Pronunciation Say TINAKSITE
Help on Synonym: Synonym: ICSD 10502
  PDF 18-1382

Tinaksite Image

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  Tinaksite   Charoite

Comments: Yellow-brown prismatic tinaksite crystals in purple charoite with black aegirine.
Location: Murun, Aldan Uplift, Chara and Olekma Rivers, near Olekminsk, Republic of Sakha, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Charoite   Tinaksite

Comments: Polished slab of deep purple chariote with inclusions of black augite, white feldspar and orange tinaksite.
Location: Murun, Siberia, Russia. Scale: Picture size 10 cm.
© Kevin Ward

Tinaksite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8504:1:0.5792
Help on Cell Dimensions: Cell Dimensions: a = 10.35, b = 12.17, c = 7.05, Z = 2; alpha = 91°, beta = 99.333°, gamma = 92.5° V = 875.29 Den(Calc)= 2.85
Help on Crystal System: Crystal System: Triclinic Space Group: P1,P 1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.3(1), 3.25(0.8), 2.331(0.56),

Physical Properties of Tinaksite

Help on Cleavage: Cleavage: {010} Perfect, {110} Indistinct
Help on Color: Color: Pink, Pale yellow, Light brown.
Help on Density: Density: 2.82
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Tinaksite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2199,KPDmeas= 0.2222,KC= 0.2231
Ncalc = 1.63 - 1.64
Help on Optical Data: Optical Data: Biaxial (+), a=1.593, b=1.621, g=1.666, bire=0.0730
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): pale orange yellow.

Calculated Properties of Tinaksite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Tinaksite =2.82 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETinaksite = 4.91 barns/electron
U=PETinaksite x relectron= 13.70 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 148.49 (Gamma Ray American Petroleum Institute Units)
Concentration of Tinaksite per GRapi unit = 0.67 (%)

Estimated Radioactivity from Tinaksite - barely detectable


Tinaksite Classification

Help on  Dana Class: Dana Class: (67)Inosilicate Unbranched Chains with W>2
  (67.02)with W=5
  (67.02.01)Tinaksite group Tinaksite K2Na(Ca,Mn)2(Ti,Fe)O[Si7O18(OH)] P1,P 1 Tri Tokkoite K2Ca4[Si7O18(OH)](F,OH) P1 1 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 Tinaksite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Tinaksite :
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: Strunz No: 09.DG.75





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