Ussingite Mineral Data

Ussingite Mineral Data +

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General Ussingite Information

Chemical Formula:

Na2AlSi3O8(OH)

Composition:

Molecular Weight = 302.22 gm

Sodium 15.21 % Na 20.51 % Na₂O

Aluminum 8.93 % Al 16.87 % Al₂O₃

Silicon 27.88 % Si 59.64 % SiO₂

Hydrogen 0.33 % H 2.98 % H₂O

Oxygen 47.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂AlSi₃O₈(OH)

Environment:

Syenite pegmatites. Distinguished from sodalite by lack of fluorescence.

IMA Status:

Valid Species (Pre-IMA) 1915

Locality:

Kangerdluarusuk, Ilimaussaq, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for Niels Viggo Ussing (1864-1911), Copenhagen, Denmark.

Synonym:

ICSD 6265

PDF 28.1037

Ussingite Image

Images:

Ussingite Cuprostibite

Comments: Massive ussingite hosting grains of the very rare copper antimony-thallium bearing cuprostibite.
Location: Ilimaussaq, Tasseq, Greenland. Scale: 4.8 x3.4 cm.
© John Veevaert

Images:

Ussingite Vuonnemite

Comments: Massive, violet colored ussingite with a single bladed partial crystal of white vuonnemite 1.5 cm in length.
Location: Mt. Karnasurf, Lovozero, Russia. Scale: 4.2 x 3 cm.
© John Veevaert

Images:

Ussingite Gerasimovskite

Comments: Pale tan gerasimovskite pseudomorphous after epistolite crystal, in purple ussingite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ussingite Crystallography

Axial Ratios:

a:b:c =0.944:1:1.1297

Cell Dimensions:

a = 7.256, b = 7.686, c = 8.683, Z = 2; alpha = 90.75°, beta = 99.75°, gamma = 122.48° V = 402.57 Den(Calc)= 2.49

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.993(1), 6.502(0.69), 4.245(0.54),

Crystal Structure:

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Rossi G , Tazzoli V , Ungaretti L , American Mineralogist , 59 (1974) p.335-340, The crystal structure of ussingite

Physical Properties of Ussingite

Cleavage:

[001] Perfect, [110] Perfect

Color:

White, Light violet red, Dark violet red, Pink, Reddish violet.

Density:

2.46 - 2.5, Average = 2.48

Diaphaniety:

Transparent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

6.5 - Pyrite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ussingite

Gladstone-Dale:

CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2084,KPDmeas= 0.2092,KC= 0.2081

Optical Data:

Biaxial (+), a=1.504, b=1.508-1.509, g=1.543-1.545, bire=0.0390-0.0410, 2V(Calc)=40-42, 2V(Meas)=32-39.

Pleochroism (x):

pleochroic.

Pleochroism (y):

pleochroic.

Pleochroism (z):

pleochroic.

Calculated Properties of Ussingite

Electron Density:

r_electron=2.47 gm/cc
note: r_Ussingite=2.49 gm/cc.

Fermion Index

Fermion Index = 0.01324
Boson Index = 0.98676

Photoelectric:

PE_Ussingite= 1.58 barns/electron
U=PE_Ussingite x r_electron= 3.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ussingite is Not Radioactive

Ussingite Classification

Dana Class:

76.3.3.1 (76)Tectosilicate Al-Si Framework

(76.3)with other Be/Al/Si frameworks

(76.3.3)Dana Group

76.3.3.1 Ussingite Na2AlSi3O8(OH) P1 1

Strunz Class:

VIII/J.14-10 VIII - Silicates

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

VIII/J.14 - Sodalite group, Ussingite series

VIII/J.14-10 Ussingite Na2AlSi3O8(OH) P1 1

Other Ussingite Information

References:

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

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Ussingite

Na2AlSi3O8(OH)
Dana No: 76.3.3.1 Strunz No: VIII/J.14-10
Locality:

Notes: