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Elpidite

A valid IMA mineral species - grandfathered
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00123590014947681791915.jpg
Elpidite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
00463360014947681837292.jpg
Elpidite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
01498700014947681899507.jpg
Elpidite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
00123590014947681791915.jpg
Elpidite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
00463360014947681837292.jpg
Elpidite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
03115870014947062277802.jpg
Elpidite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
00123590014947681791915.jpg
Elpidite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
00463360014947681837292.jpg
Elpidite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
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About ElpiditeHide

Formula:
Na2ZrSi6O15 · 3H2O
Colour:
Colorless, white, gray, yellowish, orange, brown, beige
Lustre:
Vitreous, Waxy, Silky, Dull
Hardness:
5
Specific Gravity:
2.52 - 2.62
Crystal System:
Orthorhombic
Name:
The name derives from the Greek word for hope, representing the hope that other interesting minerals would be found at the type locality.
Dimorph of:
Yusupovite
A highly hydrated variety, bearing large admixture of hydronium ions, is known (Zubkova et al. 2021).


Unique IdentifiersHide

Mindat ID:
1370
Long-form identifier:
mindat:1:1:1370:9
GUID
(UUID V4):
9fdbfbe1-54e8-4136-8c98-59ccce91c687

IMA Classification of ElpiditeHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1894
Type description reference:
Lindström, G. (1894) Elpidit, ett nytt mineral frÄn Igaliko, Geologiska Föreningens i Stockholm Förhandlingar: 16: 330-335.

Classification of ElpiditeHide

Strunz-mindat (2024):
9.DG.65

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
Dana 8th ed.:
72.5.4.2

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
Hey's CIM Ref.:
14.10.9

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf

Mineral SymbolsHide

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

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

Pronunciation of ElpiditeHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of ElpiditeHide

Lustre:
Vitreous, Waxy, Silky, Dull
Transparency:
Transparent, Translucent, Opaque
Colour:
Colorless, white, gray, yellowish, orange, brown, beige
Hardness:
5 on Mohs scale
Cleavage:
Perfect
On {110}
Fracture:
Splintery
Density:
2.52 - 2.62 g/cm3 (Measured)    2.59 g/cm3 (Calculated)

Optical Data of ElpiditeHide

Type:
Biaxial (+)
RI values:
nα = 1.560 nβ = 1.565 - 1.569 nγ = 1.574
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v moderate
Optical Extinction:
X = c; Y = b; Z = a.

Chemistry of ElpiditeHide

Mindat Formula:
Na2ZrSi6O15 · 3H2O
Elements listed:
H, Na, O, Si, Zr - search for minerals with similar chemistry
Common Impurities:
Ti,Nb,Ca,K,F,Cl

Crystallography of ElpiditeHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 7.29 Å, b = 14.3 Å, c = 7.03 Å
Ratio:
a:b:c = 0.51 : 1 : 0.492
Unit Cell V:
732.86 ų (Calculated from Unit Cell)
Comment:
Space group of the hydrated (H3O)-bearing) variety is Pma2

Crystallographic forms of ElpiditeHide

Crystal Atlas:
Image Loading
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Elpidite no.3 - Goldschmidt (1913-1926)
Elpidite no.5 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000303ElpiditeCannillo E, Rossi G, Ungaretti L (1973) The crystal structure of elpidite American Mineralogist 58 106-10919730293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
3.26 Å(100)
3.12 Å(70)
1.945 Å(70)
1.759 Å(70)
1.590 Å(70)
1.352 Å(70)
1.492 Å(60)
Comments:
NarssĂąrssuk pegmatite, Greenland.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of ElpiditeHide

Type Locality:
ⓘ Narssñrssuk pegmatite, Narsaarsuk Plateau, Igaliku, Kujalleq, Greenland
Place of Conservation of Type Material:
University of Copenhagen, Copenhagen, Denmark.
Reference:
Lindström, G. (1894) Elpidit, ett nytt mineral frÄn Igaliko, Geologiska Föreningens i Stockholm Förhandlingar: 16: 330-335.

Other Language Names for ElpiditeHide

Varieties of ElpiditeHide

Calcium-bearing ElpiditeHigh-temperature elpidite of magmatic origin typical for agpaitic granites. Usually enriched in Ca; has orange colour in difference from secondary hydrothermal low-temperature elpidites from nepheline-syenites.

Common AssociatesHide

Associated Minerals Based on Photo Data:
78 photos of Elpidite associated with AegirineNaFe3+Si2O6
73 photos of Elpidite associated with AlbiteNa(AlSi3O8)
64 photos of Elpidite associated with RhodochrositeMnCO3
51 photos of Elpidite associated with MicroclineK(AlSi3O8)
35 photos of Elpidite associated with FluoriteCaF2
31 photos of Elpidite associated with CalciteCaCO3
25 photos of Elpidite associated with Nenadkevichite(Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O
24 photos of Elpidite associated with CatapleiiteNa2Zr(Si3O9) · 2H2O
24 photos of Elpidite associated with Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2
23 photos of Elpidite associated with QuartzSiO2

Related Minerals - Strunz-mindat GroupingHide

9.DG.CalcinaksiteKNaCa(Si4O10) · H2OTric. 1 : P1
9.DG.Barrydawsonite-(Y)Na1.5Y0.5CaSi3O8(OH)Mon. 2/m : P21/b
9.DG.ParatobermoriteCa4(Al0.5Si0.5)2Si4O16(OH)(H2O)2 · (Ca · 3H2O)Mon. 2/m
9.DG.AlvesiteNaKZrSi6O15 · 2H2OOrth. mmm (2/m 2/m 2/m)
9.DG.02SteedeiteNaMn2[Si3BO9](OH)2Tric. 1 : P1
9.DG.02NolzeiteNaMn2[Si3BO9](OH)2 · 2H2OTric. 1 : P1
9.DG.05BustamiteCaMn2+(Si2O6)Tric. 1 : P1
9.DG.05FerrobustamiteCaFe2+(Si2O6)Tric. 1
9.DG.05PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
9.DG.05SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
9.DG.05WollastoniteCa3(Si3O9)Tric. 1 : P1
9.DG.05Wollastonite-1ACaSiO3Tric. 1 : P1
9.DG.05TanohataiteLiMn2Si3O8(OH)Tric. 1 : P1
9.DG.05SchizoliteNaCaMnSi3O8(OH)Tric. 1 : P1
9.DG.05MurakamiiteLiCa2Si3O8(OH)Tric. 1 : P1
9.DG.05DalnegorskiteCa5Mn(Si3O9)2Tric. 1 : P1
9.DG.07CascanditeCaScSi3O8(OH)Tric. 1
9.DG.08PlombiÚrite[Ca4Si6O16(OH)2 · 2H2O] · (Ca · 5H2O)Orth.
9.DG.10Clinotobermorite[Ca4Si6O17 · 2H2O] · (Ca · 3H2O)Mon.
9.DG.10RiversideiteCa5(HSi3O9)2 · 2H2OOrth.
9.DG.10TobermoriteCa4Si6O17(H2O)2 · (Ca · 3H2O)Mon. 2 : P21
9.DG.12JusiteNa2Ca15Al4Si16O54 · 17H2O
9.DG.12KenotobermoriteCa4Si6O15(OH)2(H2O)2 · 3H2OMon.
9.DG.15FoshagiteCa4(Si3O9)(OH)2Tric. 1 : P1
9.DG.20JenniteCa9(Si3O9)2(OH)8 · 8H2OTric. 1 : P1
9.DG.20KameneviteK2TiSi3O9 · H2OOrth. 2 2 2 : P21 21 21
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth. mm2
9.DG.25UmbiteK2(Zr,Ti)Si3O9 · H2OOrth. 2 2 2 : P21 21 21
9.DG.30SĂžrenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
9.DG.32Escheite Ca2NaMnTi5[Si12O34]O2(OH)3 · 12H2OOrth. mm2 : Ama2
9.DG.35XonotliteCa6(Si6O17)(OH)2Mon. 2/m : B2/m
9.DG.40HillebranditeCa2(SiO3)(OH)2Orth. mmm (2/m 2/m 2/m) : Cmcm
9.DG.45ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2OOrth.
9.DG.45ChivruaiiteCa4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2OOrth. 2 2 2 : C2 2 2
9.DG.55EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
9.DG.60EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
9.DG.65PatyniteNaKCa4[Si9O23]Tric. 1 : P1
9.DG.67WhelaniteCu2+2Ca6[Si6O17(OH)](CO3)(OH)3 · 2H2OOrth. mm2 : Pnn2
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)Tric. 1 : P1
9.DG.70LitidioniteCuNaKSi4O10Tric. 1 : P1
9.DG.70ManaksiteKNaMnSi4O10Tric. 1 : P1
9.DG.70YusupoviteNa2Zr(Si6O15) · 2.5H2OMon. 2/m : B2/m
9.DG.70EnricofrancoiteKNaCaSi4O10Tric. 1 : P1
9.DG.75TinaksiteK2Na(Ca,Mn2+)2TiO[Si7O18(OH)]Tric.
9.DG.75TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
9.DG.75SenkevichiteCsKNaCa2TiO[Si7O18](OH)Tric. 1 : P1
9.DG.80CanasiteK3Na3Ca5Si12O30(OH)4Mon. m : Bm
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2OMon. m : Bm
9.DG.85MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
9.DG.90FrankameniteK3Na3Ca5(Si12O30)(F,OH)4 · H2OTric. 1 : P1
9.DG.92Charoite(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2OMon. 2/m : P21/m
9.DG.95YuksporiteK4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3Mon. 2/m : P21/m
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14Mon. 2/m : P2/m

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 ElpiditeHide

References for ElpiditeHide

Reference List:
Lindström, G. (1894) Elpidit, ett nytt mineral frÄn Igaliko, Geologiska Föreningens i Stockholm Förhandlingar: 16: 330-335.
Neronova, N.N., Belov, N.V. (1964) Crystal structure of elpidite, Na2Zr[Si6O15]·3H2O. Soviet Physics - Crystallography: 9: 700-705.
Chao, G. Y. (1967) Leucophanite, elpidite, and narsarsukite from the Desourdy quarry, Mont St. Hilaire, Quebec. The Canadian Mineralogist, 9 (2) 286-287
Cannillo, Elio, Rossi, Guiseppe, Ungaretti, Luciano (1973) The crystal structure of elpidite. American Mineralogist, 58 (1-2) 106-109
Sapozhnikov, A.N., Kashaev, A.A. (1978) Features of the crystal structure of calcium-containing elpidite. Kristallografiya (Sov. Phys. Crystal.): 23: 52-65. (in Russian)
Currie, K. L., Zaleski, E. (1985) The relative stability of elpidite and vlasovite: a P-T indicator for peralkaline rocks. The Canadian Mineralogist, 23 (4) 577-582
Merlino, S., Bonaccorsi, E. (2008) Double wollastonite chains: topological/conformational varieties, polytypic forms, isotypic compounds. Zeitschrift fĂŒr Kristallographie: 223: 85-97.
Grigor’eva, A.A., Zubkova, N.V., Pekov, I.V., Kolitsch, U., Pushcharovsky, D.Yu., Vigasina, M.F., Giester, G., Dordević, T., Tillmanns, E., Chukanov, N.V. (2011) Crystal chemistry of elpidite from Khan Bogdo (Mongolia) and its K- and Rb-exchanged forms. Crystallography Reports: 56: 832-841.
Grice, Joel D., Rowe, Ralph, Poirier, Glenn (2015) Hydroterskite: A New Mineral Species From the Saint-Amable Sill, Quebec, and A Comparison With Terskite and Elpidite. The Canadian Mineralogist, 53 (5) 821-832 doi:10.3749/canmin.1400105
Cametti, G., Armbruster, T., Nagashima, M. (2016) Dehydration and thermal stability of elpidite: An in-situ single crystal X-ray diffraction study. Microporous And Mesoporous Materials: 227: 81-87.
Zubkova, N.V., Pekov, I.V., Chukanov, N.V., Yapaskurt, V.O., Turchkova, A.G., Larikova, T.S., Pushcharovsky, D.Yu. (2021): A highly hydrated variety of elpidite from the Khibiny alkaline complex, Kola Peninsula, Russia. Mineralogical Magazine: 85(4): 627-633.
(2023) Elpidite. Handbook of Mineralogy. Mineralogical Society of America
forum.amiminerals.it (n.d.) http://forum.amiminerals.it/viewtopic.php?f=5&t=16793&sid=caa89199acc501d3dcefb03b0478b3d8

Localities for ElpiditeHide

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
 
  • Ontario
    • Thunder Bay District
McLaughlin (1990)
  • QuĂ©bec
    • MontĂ©rĂ©gie
      • La VallĂ©e-du-Richelieu RCM
        • Mont Saint-Hilaire
166-175. +5 other references
      • Lajemmerais RCM
        • Varennes & St-Amable
HorvĂĄth et al. (1998)
HorvĂĄth et al. (1998)
    • MontrĂ©al
176-178. +2 other references
      • MontrĂ©al-Est
Canadian Museum of Nature collection
Birkett et al. (1992) +2 other references
China
 
  • Inner Mongolia
    • Tongliao City (Tongliao Prefecture)
      • Jarud Banner (Zalute Co.)
Wu et al. (2021)
Egypt
 
  • Red Sea Governorate
Stern et al. (1985) +3 other references
France
 
  • Corsica
    • Corse-du-Sud
      • Ajaccio
        • Cristinacce
l'exemple de l'association du Vieux Pont d'Ota. Bulletin de la Société Géologique de France (4) +5 other references
Greenland (TL)
 
  • Kujalleq
    • Igaliku
      • Narsaarsuk Plateau
Lindström (1894) +1 other reference
[Mineralogical Record - Vol 24 No 2] +2 other references
India
 
  • Rajasthan
    • Jodhpur Division
      • Barmer District
        • Malani Igneous Province
Mondal et al. (2021)
Kazakhstan
 
  • Abai Region
    • Tarbagatai Range
      • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
Mineev D.A. (1968)
  • East Kazakhstan Region
Malawi
 
  • Southern Region
    • Zomba
Mongolia
 
  • Dornogovi Province
    • Khatanbulag District
Kynicky et al. (2018)
  • Khovd Province
    • Myangad District
Kovalenko V.I. et al. (1995) +1 other reference
Kovalenko et al. (1995) +2 other references
      • Khalzan Buregte
Kempe et al. (2015)
Dostal et al. (2022) +1 other reference
  • Ömnögovi Province
    • Khanbogd District
Vladykin N.V. et al. (1981) +5 other references
Jindrich Kynicky
  • Uvs Province
    • Zavkhan District
Dostal et al. (2022)
Morocco
 
  • DrĂąa-Tafilalet Region
    • Midelt Province
      • Midelt Cercle
        • AĂŻt Oufella CaĂŻdat
          • Amersid
Khadem Allah (1993)
Norway
 
  • Oslo
    • Oslomarka
Kvamsdal (2018)
  • Vestfold
    • FĂŠrder
      • FĂŠrder Islands
Andersen (2017)
Alf Olav Larsen communication to Svein ...
    • Larvik
      • Hedrum
Larsen et al. (2009)
      • Stavern (FredriksvĂ€rn)
        • Jahren pegmatite
Andresen et al. (2018)
Engvoldsen et al. (1991)
    • Sandefjord
      • ØsterĂžya
Berge et al. (2002)
      • VesterĂžya
Berge et al. (2011)
Berge (n.d.) +1 other reference
Engvoldsen et al. (1991) +1 other reference
Engvoldsen et al. (1991)
Engvoldsen et al. (1991)
Raade et al. (1980)
  • Viken
    • Lunner
Am Min 90:1227 +1 other reference
    • Nittedal
Kvamsdal (2018)
Poland
 
  • Warmian-Masurian Voivodeship
    • EƂk County
Armbrustmacher et al. (1994) +6 other references
Portugal
 
  • Azores
    • SĂŁo Miguel
Samples collected by Luigi Chiappino ... +1 other reference
      • Ribeira Grande
Luigi Chippiano collection (2013)
Russia
 
  • Aldan Shield
    • Chara and Tokko Rivers Confluence
[Lapis 1993:4 p.13-20]
  • Buryatia
    • Mama River Basin
      • Maigunda River
Vladykin et al. (2017)
  • Murmansk Oblast
    • Khibiny Massif
      • Kukisvumchorr Mt
        • Kirovskii apatite mine
Pekov (2003)
Đ„ĐŸĐŒŃĐșĐŸĐČ Đ.П. et al. (1981)
    • Kovdorsky District
Mikhailova et al. (2015)
    • Lovozersky District
Pekov (1998)
Kartashov et al. (2006)
Pekov (1998) +3 other references
Pekov et al. (1999) +2 other references
New Data on Minerals M. +1 other reference
      • Keivy Mountains
Macdonald et al. (2022)
Ivanyuk et al. (2006)
      • Kuftnyun Mountain
Pekov (1998)
[World of Stones 95:5-6
Saudi Arabia
 
  • Ha'il Region
Stoeser et al. (1985) +1 other reference
Spain
 
  • Canary Islands
    • Santa Cruz de Tenerife Province
      • Tenerife
Dill et al. (2023)
UK
 
  • Scotland
    • Outer Hebrides
Judd +9 other references
Young et al. (1978)
USA
 
  • Arkansas
    • Hot Spring County
      • Magnet Cove
Smith (1988)
Henry Barwood - unpublished (2010)
Tank (1972) +3 other references
  • New Mexico
    • Otero County
      • Cornudas Mountains
Michael C. Michayluk collection
Northrop et al. (1996)
  • North Carolina
Smithsonian Institution Mineral ...
  • Utah
    • Uintah County
      • Uteland Knoll Mining District (Ouray Mining District)
        • Ouray
Milton (1977)
  • Washington
    • Okanogan County
      • Golden Horn Batholith
Micro Probe Volume VI Number 8 +1 other reference
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