Tinaksite Mineral Data

Tinaksite Mineral Data +

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General Tinaksite Information

Chemical Formula:

K2Na(Ca,Mn++)2(Ti,Fe)O[Si7O18(OH)]

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

Empirical Formula:

K₂NaCa_1.75Mn²⁺_0.25Ti_0.85Fe²⁺_0.15Si₇O₁₉(OH)

Environment:

K-feldspar metasomatites in contact with limestone.

IMA Status:

Approved IMA 1965

Locality:

Murun alkalic massif, near Olekminsk, Yakutia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named fro the symbols of some of its component elements (Ti, Na, K).

Synonym:

ICSD 10502

PDF 18-1382

Tinaksite Image

Images:

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

Images:

Tinaksite Charoite

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

Axial Ratios:

a:b:c =0.8504:1:0.5792

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

Crystal System:

TriclinicSpace Group: P1,P 1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.3(1), 3.25(0.8), 2.331(0.56),

Crystal Structure:

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Bissert G , Acta Crystallographica, Section B , 36 (1980) p.259-263, Verfeinerung der struktur von tinaksit, Ca2K2NaTiO[Si7O18(OH)], Note: z-coordinate of Si4 adjusted to match reported bond lengths

Physical Properties of Tinaksite

Cleavage:

[010] Perfect, [110] Indistinct

Color:

Pink, Pale yellow, Light brown.

Density:

2.82

Diaphaniety:

Transparent to Translucent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tinaksite

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

Optical Data:

Biaxial (+), a=1.593, b=1.621, g=1.666, bire=0.0730

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

pale orange yellow.

Calculated Properties of Tinaksite

Electron Density:

r_electron=2.79 gm/cc
note: r_Tinaksite=2.82 gm/cc.

Fermion Index

Fermion Index = 0.01979
Boson Index = 0.98021

Photoelectric:

PE_Tinaksite= 4.91 barns/electron
U=PE_Tinaksite x r_electron= 13.70 barns/cc.

Radioactivity:

GRapi = 148.49 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Tinaksite - barely detectable

Tinaksite Classification

Dana Class:

67.2.1.1 (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

Strunz Class:

VIII/F.22-30 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 Tinaksite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Tinaksite

K2Na(Ca,Mn++)2(Ti,Fe)O[Si7O18(OH)]
Dana No: 67.2.1.1 Strunz No: VIII/F.22-30
Locality:

Notes: