Ussingite Mineral Data

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.

Name Pronunciation:

Ussingite + Pronunciation

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2067,KPDmeas= 0.2092,KC= 0.2081
Ncalc = 1.51 - 1.52

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:

Bulk Density (Electron Density)=2.46 gm/cc
note: Specific Gravity of Ussingite =2.48 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Ussingite= 1.58 barns/electron
U=PE_Ussingite x rElectron Density= 3.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ussingite is Not Radioactive

Ussingite Classification

Dana Class:

76.03.03.01 (76)Tectosilicate Al-Si Framework

(76.03)with other Be/Al/Si frameworks

(76.03.03)Dana Group

76.03.03.01 Ussingite Na2AlSi3O8(OH) P1 1

Strunz Class:

09.EH.20 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EH -Transitional structures between phyllosilicate and other silicate units

09.EH.20 Ussingite Na2AlSi3O8(OH) P1 1

Other Ussingite Information

References:

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

See Also:

Links to other databases for Ussingite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

Search for Ussingite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ussingite :

A Bijoux Google Search for Ussingite
Adam's Minerals Google Search for Ussingite
Cape Minerals Google Search for Ussingite
Dakota Matrix Minerals Google Search for Ussingite
Excalibur Mineral Corp. Google Search for Ussingite
Exceptional Minerals Google Search for Ussingite
John Betts Fine Minerals Search for Ussingite
McDougall Minerals Google Search for Ussingite
Mineral News Website Link
Rock and Mineral Shows Google Search for Ussingite
Weinrich Minerals, Inc. Google Search for Ussingite

Ask about Ussingite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Ussingite Specimen Label here :

Ussingite

Na2AlSi3O8(OH)
Dana No: 76.03.03.01 Strunz No: 09.EH.20
Locality:

Notes: