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Trinepheline

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Formula:
NaAlSiO4
Colour:
White to pale yellow
Lustre:
Sub-Vitreous, Greasy
Hardness:
5 - 5½
Specific Gravity:
2.642 (Calculated)
Crystal System:
Hexagonal
Name:
Named in 2012 by Cristiano Ferraris, Sylvain Pont, Gian Carlo Parodi, Benjamin Rondeau, and Jean-Pierre Lorand for the polymorphic relationship to nepheline.
Dimorph of:
Trinepheline is a pseudomorph after jadeite with fabrièsite and occurs as skeletal crystals up to 15–20 μm long and 5–10 μm wide.

Likely polymorphous with so-called carnegieite and 'α-carnegieite'.

Compare also an unnamed monohydrated phase 'UM1967-10-SiO:AlHNa'.


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Classification of TrinephelineHide

Approved
Approval Year:
2012

Physical Properties of TrinephelineHide

Sub-Vitreous, Greasy
Transparency:
Transparent
Colour:
White to pale yellow
Streak:
White
Hardness:
5 - 5½ on Mohs scale
Density:
2.642 g/cm3 (Calculated)

Chemical Properties of TrinephelineHide

Formula:
NaAlSiO4
IMA Formula:
NaAlSiO4

Crystallography of TrinephelineHide

Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P61
Setting:
P61
Cell Parameters:
a = 9.995(2) Å, c = 24.797(4) Å
Ratio:
a:c = 1 : 2.481
Unit Cell V:
2,145.34 ų (Calculated from Unit Cell)
Comment:
+ spacegroup P65

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0002011TrinephelineKahlenberg V, Bohm H (1998) Crystal structure of hexagonal trinepheline - A new synthetic NaAlSiO4 modification American Mineralogist 83 631-6371998synthetic0293
0004612TrinephelineVulic P, Kahlenberg V, Konzett J (2008) On the existence of a Na-deficient monoclinic trinepheline with composition Na7.85Al7.85Si8.15O32 American Mineralogist 93 1072-10792008synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.328Å(22)
4.133Å(49)
3.834Å(81)
3.272Å(40)
3.163Å(100)
2.989Å(21)
2.403Å(31)
2.401Å(22)

Type Occurrence of TrinephelineHide

General Appearance of Type Material:
Intergrown with nepheline and fabrièsite
Place of Conservation of Type Material:
Muséum National d’Histoire naturelle(MNHN), Paris, France,registration number MNHN 212-001
Associated Minerals at Type Locality:

Synonyms of TrinephelineHide

Relationship of Trinepheline to other SpeciesHide

Other Members of this group:
Cancrinite GroupA large, structurally complex group of alumosilicates.
CarnegieiteNaAlSiO4Tric.
Davidsmithite(Ca,□)2Na6Al8Si8O32Hex. 6 : P63
KalsiliteKAlSiO4Hex. 6 2 2 : P63 2 2
LeuciteK(AlSi2O6)Tet. 4/m : I41/a
MetaleuciteA name for isometric leucite that is stable above 625 degrees C.
NephelineNa3K(Al4Si4O16)Hex. 6 : P63
Sodalite GroupThe Sodalite Group is characterised by sodalite-type stacking of alumosilicate building units that produces ...
Trikalsilite(K,Na)AlSiO4Hex.
Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3

Fluorescence of TrinephelineHide

Not fluorescent in UV

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.

References for TrinephelineHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Parodi, G.C., Pont, S., Ferraris, C.,Rondeau, B. and Lorand, J.P. (2012):Trinepheline, IMA 2012-024. CNMNC Newsletter No. 14, October 2012, page 1283; Mineralogical Magazine, 76, 1281-1288.
Ferraris, C., Parodi, G.C., Pont, S., Rondeau, B., Lorand, J.-P. (2014): Trinepheline and fabriesite: two new mineral species from the jadeite deposit of Tawmaw (Myanmar). European Journal of Mineralogy, 26, 257-263.

Internet Links for TrinephelineHide

Localities for TrinephelineHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Myanmar (TL)
 
  • Kachin State
    • Mohnyin District
      • Hpakant Township (Hpakan; Phakant; Phakan)
        • Hpakant-Tawmaw Jade Tract
Parodi, G.C., Pont, S., Ferraris, C.,Rondeau, B. and Lorand, J.P. (2012):Trinepheline, IMA 2012-024. CNMNC Newsletter No. 14, October 2012, page 1283; Mineralogical Magazine, 76, 1281-1288; Ferraris, C., Parodi, G.C., Pont, S., Rondeau, B., Lorand, J.-P. (2014): Trinepheline and fabriesite: two new mineral species from the jadeite deposit of Tawmaw (Myanmar). European Journal of Mineralogy, 26, 257-263.
 
Mineral and/or Locality  
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