Tiettaite Mineral Data

General Tiettaite Information

Chemical Formula:

(Na,K)17Fe+++TiSi16O29(OH)30•2(H2O)

Composition:

Molecular Weight = 2,066.91 gm

Potassium 13.24 % K 15.95 % K₂O

Sodium 11.12 % Na 14.99 % Na₂O

Titanium 2.32 % Ti 3.86 % TiO₂

Iron 2.70 % Fe 3.86 % Fe₂O₃

Silicon 21.74 % Si 46.51 % SiO₂

Hydrogen 1.66 % H 14.82 % H₂O

Oxygen 47.22 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₁₀K₇Fe³⁺TiSi₁₆O₂₉(OH)₃₀•2(H₂O)

Environment:

Ultra-agpaitic pegmatites.

IMA Status:

Approved IMA 1993

Locality:

Mt. Ruasvumchorr and Mt. Koashva, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named from the Finnish "tietta", science or knowledge, for the first science station in Khibiny.

Name Pronunciation:

Tiettaite + Pronunciation

Synonym:

IMA1991-013

Tiettaite Crystallography

Axial Ratios:

a:b:c =2.699:1:1.5513

Cell Dimensions:

a = 29.77, b = 11.03, c = 17.111, Z = 4; V = 5,618.62 Den(Calc)= 2.44

Crystal System:

Orthorhombic Space Group: C mcm,C mc2₁,C 2mc

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

By Intensity(I/I_o): 10.38(1), 2.773(0.9), 3.097(0.8),

Physical Properties of Tiettaite

Cleavage:

{100} Perfect, {010} Perfect

Color:

Colorless, Grayish white, Dark gray.

Density:

2.42

Diaphaneity:

Transparent

Fracture:

Even - Flat surfaces (not cleavage) fractured in an even pattern.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

3 - Calcite

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Tiettaite

Gladstone-Dale:

CI meas= 0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2238,KPDmeas= 0.2257,KC= 0.2342
Ncalc = 1.57

Optical Data:

Biaxial (-), a=1.53-1.532, b=1.548-1.549, g=1.559, bire=0.0270-0.0290, 2V(Calc)=74, 2V(Meas)=79. Dispersion r < v moderate.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Tiettaite

Electron Density:

Bulk Density (Electron Density)=2.43 gm/cc
note: Specific Gravity of Tiettaite =2.42 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Tiettaite= 3.51 barns/electron
U=PE_Tiettaite x r_electron= 8.51 barns/cc.

Radioactivity:

GRapi = 191.70 (Gamma Ray American Petroleum Institute Units)
Concentration of Tiettaite per GRapi unit = 0.52 (%)

Estimated Radioactivity from Tiettaite - barely detectable

Tiettaite Classification

Dana Class:

78.06.04.01 (78)Unclassified silicates

(78.06)possible tectosilicates

(78.06.04)Dana Group

78.06.04.01 Tiettaite (Na,K)17FeTiSi16O29(OH)30•2(H2O) C mcm,C mc2₁,C 2mc Ortho

Strunz Class:

09.HA.90 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HA -With alkali and alkali-earth Elements

09.HA.90 Tiettaite (Na,K)17FeTiSi16O29(OH)30•2(H2O) C mcm,C mc2₁,C 2mc Ortho

Other Tiettaite Information

References:

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

See Also:

Links to other databases for Tiettaite :
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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Print or Cut-and-Paste your Tiettaite Specimen Label here :

Tiettaite

(Na,K)17Fe+++TiSi16O29(OH)30•2(H2O)
Dana No: 78.06.04.01 Strunz No: 09.HA.90
Locality:

Notes:

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