Tugtupite Mineral Data

Tugtupite Mineral Data +

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General Tugtupite Information

Chemical Formula:

Na4AlBeSi4O12Cl

Composition:

Molecular Weight = 467.74 gm

Sodium 19.66 % Na 26.50 % Na₂O

Beryllium 1.93 % Be 5.35 % BeO

Aluminum 5.77 % Al 10.90 % Al₂O₃

Silicon 24.02 % Si 51.38 % SiO₂

Chlorine 7.58 % Cl 7.58 % Cl

- % Cl -1.71 % -O=Cl₂

Oxygen 41.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₄AlBe(Si₄O₁₂)Cl

Environment:

Alkali-rich, silica-poor intrusive igneous rocks.

IMA Status:

Approved IMA 1962

Locality:

Tugtup agatakorfia, Tunugdliarfik, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named after its locality

Synonym:

ICSD 69958

PDF 38-472

Tugtupite Image

Images:

Tugtupite

Comments: Albite hosting a 1.2 cm mass of partially gem quality tugtupite.
Location: Tugtup, Greenland. Scale: 2.1 x1.3 cm.
© John Veevaert

Tugtupite Crystallography

Axial Ratios:

a:c = 1:1.02726

Cell Dimensions:

a = 8.583, c = 8.817, Z = 2; V = 649.53 Den(Calc)= 2.39

Crystal System:

Tetragonal - DisphenoidalH-M Symbol (4) Space Group: I 4

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

By Intensity(I/I_o): 3.52(1), 6.13(0.8), 3.57(0.6),

Crystal Structure:

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Antao S M , Hassan I , Parise J B , American Mineralogist , 89 (2004) p.492-497, Tugtupite: High-temperature structures obtained from in situ synchrotron, diffraction and Rietveld refinements, T = 20 C, data from Hassan and Grundy (1991)

View Additional jPOWD Structure files for Tugtupite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Tugtupite

Cleavage:

[111] Imperfect

Color:

White, Pink, Crimson, Blue, Green.

Density:

2.36

Diaphaniety:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4 - Fluorite

Luminescence:

Fluorescent and tenebrescent, Short UV=dark crimson, Long UV=light crimson.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Tugtupite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2088,KPDmeas= 0.2114,KC= 0.2166

Optical Data:

Uniaxial (+), w=1.496, e=1.502, bire=0.0060.

Calculated Properties of Tugtupite

Electron Density:

r_electron=2.32 gm/cc
note: r_Tugtupite=2.36 gm/cc.

Fermion Index

Fermion Index = 0.03068
Boson Index = 0.96932

Photoelectric:

PE_Tugtupite= 1.91 barns/electron
U=PE_Tugtupite x r_electron= 4.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tugtupite is Not Radioactive

Tugtupite Classification

Dana Class:

76.2.3.7 (76)Tectosilicate Al-Si Framework

(76.2)Feldspathoids and related species

(76.2.3)Sodalite group

76.2.3.1 Sodalite Na8Al6Si6O24Cl2 P 43n 4 3m

76.2.3.2 Nosean Na8Al6Si6O24(SO4) P 43m 4 3m

76.2.3.3 Hauyne (Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2 P 43n 4 3m

76.2.3.4 Lazurite Na3Ca(Al3Si3O12)S P 43n 4 3m

76.2.3.5 Bicchulite Ca2Al2SiO6(OH)2 I 43m 4 3m

76.2.3.6 Kamaishilite Ca2Al2SiO6(OH)2 I-lattice Tetra

76.2.3.7 Tugtupite Na4AlBeSi4O12Cl I 4 4

76.2.3.8 Tsaregorodtsevite N(CH3)4AlSi5O12 I 222 2 2 2

Strunz Class:

VIII/J.11-50 VIII - Silicates

VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders

VIII/J.11 - Sodalite group, Tsaregorodtsevite - Wadalite series

VIII/J.11-05 Tsaregorodtsevite N(CH3)4AlSi5O12 I 222 2 2 2

VIII/J.11-10 Sodalite Na8Al6Si6O24Cl2 P 43n 4 3m

VIII/J.11-20 Nosean Na8Al6Si6O24(SO4) P 43m 4 3m

VIII/J.11-30 Hauyne (Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2 P 43n 4 3m

VIII/J.11-40 Lazurite Na3Ca(Al3Si3O12)S P 43n 4 3m

VIII/J.11-50 Tugtupite Na4AlBeSi4O12Cl I 4 4

VIII/J.11-60 Kamaishilite Ca2Al2SiO6(OH)2 I-lattice Tetra

VIII/J.11-70 Bicchulite Ca2Al2SiO6(OH)2 I 43m 4 3m

VIII/J.11-80 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m

Other Tugtupite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Tugtupite

Na4AlBeSi4O12Cl
Dana No: 76.2.3.7 Strunz No: VIII/J.11-50
Locality:

Notes: