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Ussingite

A valid IMA mineral species - grandfathered
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About UssingiteHide

09010800014947414819988.jpg
Niels Viggo Ussing
Formula:
Na2AlSi3O8OH
Colour:
Pale to medium violet, reddish violet, colourless, white, purple
Lustre:
Sub-Vitreous
Hardness:
6 - 7
Specific Gravity:
2.48
Crystal System:
Triclinic
Name:
Named after Niels Viggo Ussing (14 June 1864, Copenhagen, Denmark - 23 July 1911, Copenhagen, Denmark), Professor of Mineralogy, University of Copenhagen, Denmark.
The structure is a unique, interrupted framework with strong H bonding. It is based on 4-, 6- and 8-membered rings of silicate tetrahedra, somewhat like these in feldspars but, as opposed to the latter, partially depolymerized.


Unique IdentifiersHide

Mindat ID:
4122
Long-form identifier:
mindat:1:1:4122:1
GUID
(UUID V4):
4322d500-0758-4ef1-960f-e47cb999f07b

IMA Classification of UssingiteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Na2AlSi3O8(OH)

Classification of UssingiteHide

9.EH.20

9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
76.3.3.1

76 : TECTOSILICATES Al-Si Framework
3 : Al-Si Framework with other Be/Al/Si frameworks
16.2.3

16 : Silicates Containing Aluminum and other Metals
2 : Aluminosilicates of Na

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
UsgIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of UssingiteHide

Sub-Vitreous
Transparency:
Transparent, Translucent
Colour:
Pale to medium violet, reddish violet, colourless, white, purple
Streak:
White
Hardness:
6 - 7 on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
2.48 g/cm3 (Measured)    2.51 g/cm3 (Calculated)

Optical Data of UssingiteHide

Type:
Biaxial (+)
RI values:
nα = 1.504 nβ = 1.509 nγ = 1.545
2V:
Measured: 32° to 39°, Calculated: 42°
Birefringence:
0.041
Max Birefringence:
δ = 0.041
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none
Optical Extinction:
Z angle b = 3˚

Chemistry of UssingiteHide

Mindat Formula:
Na2AlSi3O8OH
Common Impurities:
Ca,K,Cl,H2O,S

Crystallography of UssingiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.256 Å, b = 7.686 Å, c = 8.683 Å
α = 90.75°, β = 99.75°, γ = 122.48°
Ratio:
a:b:c = 0.944 : 1 : 1.13
Unit Cell V:
399.44 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals uncommon; blocky to tabular with dominant pinacoidal forms {100}, {010}, and {001}
Twinning:
{010}
Comment:
Williams & Weller (2012) data: a=7.2474(1), b=7.6813(1), c=8.6423(1), α=90.8351(1), ÎČ=99.771(1), Îł=122.581(1)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000399UssingiteRossi G, Tazzoli V, Ungaretti L (1974) The crystal structure of ussingite American Mineralogist 59 335-3401974Lovozero alkali massif, Russia0293
0019374UssingiteWilliams E R, Weller M T (2012) A variable-temperature neutron diffraction study of ussingite; a strong asymmetric hydrogen bond in an aluminosilicate framework Physics and Chemistry of Minerals 39 471-4782012Nakalaq, Ilimaussaq complex, Greenland04
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.88 Å(70)
6.35 Å(90)
4.92 Å(70)
4.18 Å(70)
3.84 Å(70)
3.47 Å(70)
2.95 Å(100)
2.69 Å(100)
Comments:
14-426

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 3a: Earth’s earliest Hadean crust>4.50
9 : Lava/xenolith minerals (hornfels, sanidinite facies)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of UssingiteHide

Geological Setting of Type Material:
Syenite pegmatite, also sodalite-bearing xenoliths

Other Language Names for UssingiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
53 photos of Ussingite associated with SeranditeNaMn2+2Si3O8(OH)
52 photos of Ussingite associated with VuonnemiteNa11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH)
38 photos of Ussingite associated with SodaliteNa4(Si3Al3)O12Cl
33 photos of Ussingite associated with ChkaloviteNa2BeSi2O6
31 photos of Ussingite associated with AegirineNaFe3+Si2O6
28 photos of Ussingite associated with UmbozeriteNa3Sr4Th[Si(O,OH)3-4]8
24 photos of Ussingite associated with Steenstrupine-(Ce)Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2O
19 photos of Ussingite associated with ManganoneptuniteKNa2Li(Mn2+)2Ti2[Si4O12]2
18 photos of Ussingite associated with TugtupiteNa4BeAlSi4O12Cl
17 photos of Ussingite associated with SphaleriteZnS

Related Minerals - Strunz-mindat GroupingHide

9.EH.05ManganoneptuniteKNa2Li(Mn2+)2Ti2[Si4O12]2Mon. m : Bb
9.EH.05NeptuniteKNa2Li(Fe2+)2Ti2[Si4O12]2Mon. m : Bb
9.EH.05WatatsumiiteKNa2Li(Mn2+)2V4+2[Si4O12]2Mon. m : Bb
9.EH.05MagnesioneptuniteKNa2Li(Mg)2Ti2[Si4O12]2Mon. 2/m : B2/b
9.EH.05RotherkopfiteKNa2Fe2+(Fe2+)2(Ti1.5Fe2+0.5)[Si4O12]2Mon. 2/m : B2/b
9.EH.10GrumantiteNa(HSi2O5) · H2OOrth. mm2 : Fdd2
9.EH.15SarcoliteNa4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl)Tet. 4/m : I4/m
9.EH.25Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2Trig. 3m : P3m1
9.EH.25Telyushenkoite(Cs,Na,K)Na6[Be2Al3Si15O39]F2Trig. 3m (3 2/m) : P3 1m
9.EH.25EirikiteKNa6Be2(Si15Al3)O39F2Trig. 3m (3 2/m) : P3m1
9.EH.30NafertisiteNa3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2Mon. 2/m
9.EH.35VebleniteKNa(Fe2+5Fe3+4Mn7)Nb4(Si2O7)2(Si8O22)2O6(OH)10(H2O)3 Tric. 1 : P1

Fluorescence of UssingiteHide

Not fluorescent

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for UssingiteHide

References for UssingiteHide

Localities for UssingiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Canada
 
  • Newfoundland and Labrador
    • Labrador
      • Seal Lake alkaline complex (Letitia Lake)
GSC locality database +1 other reference
  • QuĂ©bec
    • MontĂ©rĂ©gie
      • La VallĂ©e-du-Richelieu RCM
        • Mont Saint-Hilaire
Grice (1989) +2 other references
      • Lajemmerais RCM
        • Varennes & St-Amable
          • Saint-Amable sill
HORVÁTH (2010)
Greenland
 
  • Kujalleq
Petersen (2001) +1 other reference
BĂžggild (1953)
SĂžrensen et al. (2001)
Karup-MĂžller (1976)
          • Lilleelv
Pavel Karthasov photo (photo-203416)
Karup-MĂžller et al. (1974) +1 other reference
SĂžrensen et al. (1970)
Makovicky et al. (1980)
Pekov et al. (2001)
Amer. Mineral. et al. (abs. ref. 1) +2 other references
Semenov et al. (1968)
Karup-MĂžller et al. (2001) +2 other references
MinerShop.com photo-Photo ID: 100976
Jesse Crawford photo & collection +1 other reference
        • Nunasarnaq
Cran Cowan photo
Andersen et al. (1969)
Russia
 
  • Murmansk Oblast
    • Khibiny Massif
Pekov et al. (2004)
Haas (n.d.)
Mikhailova et al. (2023)
    • Lovozersky District
Pekov (2000) +2 other references
Pekov (1998)
Lapis +1 other reference
Pavel.M. Kartashov (n.d.)
Pekov (1998)
Pekov et al. (2001)
Pekov (1998)
Pekov (1998)
Pekov (1998) +1 other reference
        • Karnasurt mine
Pekov et al. (2004) +2 other references
        • Second Eastern Stream
Pekov (1998)
Kotriy et al. (1996)
Pekov (1998)
Pekov (1998) +2 other references
Ermolaeva et al. (2007) +1 other reference
Ermolaeva et al. (2007)
 
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