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 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 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 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
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