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Eudidymite

A valid IMA mineral species - grandfathered
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01557770014959076071037.jpg
Eudidymite

Eudidymite locality, Lille Arøya, Larvik, Vestfold, Norway
06782430017117082165800.jpg
Eudidymite

Langesundsfjorden, Norway
05658890014946635045931.jpg
Eudidymite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
09653240014949473077359.jpg
Eudidymite

Eudidymite locality, Lille Arøya, Larvik, Vestfold, Norway
05236330017055943695121.jpg
Eudidymite

Langesundsfjorden, Norway
05658890014946635045931.jpg
Eudidymite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
01557770014959076071037.jpg
Eudidymite

Eudidymite locality, Lille Arøya, Larvik, Vestfold, Norway
05236330017055943695121.jpg
Eudidymite

Langesundsfjorden, Norway
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About EudidymiteHide

Formula:
Na2Be2Si6O15 · H2O
Colour:
White, colorless
Lustre:
Vitreous, Pearly
Hardness:
6
Specific Gravity:
2.55
Crystal System:
Monoclinic
Name:
From the Greek words for well and twinned, in allusion to its common occurrence in twins.
Dimorph of:
Epididymite
During his visit in the summer of 1887 to Lille Arøya, Langesundsfjorden in Norway, the mineralogist Waldemar Christofer Brøgger (1851-1940) was shown an unknown mineral found by two local collectors. It was showed to be a new mineral and later described by Brøgger (1887, 1890).
The crystal structure was solved by Ito (1947) and Fang et al. (1972).

Note: The type locality, the island Lille Arøya, was called by Brøgger as Ober-Arö or Övre Arö. The contemporary correct name is Lille Arøya.


Unique IdentifiersHide

Mindat ID:
1421
Long-form identifier:
mindat:1:1:1421:8
GUID
(UUID V4):
e3c1a915-23df-48f2-944c-13f741a8f9e7

IMA Classification of EudidymiteHide

Classification of EudidymiteHide

Strunz-mindat (2024):
9.DG.60

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
Dana 8th ed.:
66.3.1.3

66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
3 : Amphiboles - Ca-Na subgroup
Hey's CIM Ref.:
14.3.6

14 : Silicates not Containing Aluminum
3 : Silicates of Be

Mineral SymbolsHide

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

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

Physical Properties of EudidymiteHide

Lustre:
Vitreous, Pearly
Transparency:
Transparent, Translucent
Comment:
Pearly on cleavages
Colour:
White, colorless
Streak:
White
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}, imperfect on{551}
Density:
2.55 g/cm3 (Measured)    

Optical Data of EudidymiteHide

Type:
Biaxial (+)
RI values:
nα = 1.545 nβ = 1.546 nγ = 1.551
2V:
Measured: 30° , Calculated: 50°
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v distinct

Chemistry of EudidymiteHide

Mindat Formula:
Na2Be2Si6O15 · H2O
Elements listed:
Be, H, Na, O, Si - search for minerals with similar chemistry
Common Impurities:
Al,Fe,Ca

Crystallography of EudidymiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 12.6188(10) Å, b = 7.3781(5) Å, c = 13.9940(9) Å
β = 103.762(5)°
Ratio:
a:b:c = 1.71 : 1 : 1.897
Unit Cell V:
1265.47 ų
Z:
4
Morphology:
Crystals tabular on (001), spherulitic, micaceous, coarse and granular,massive.
Twinning:
Twins on {001} common. V-shaped (Swallowtwins) twin

Crystallographic forms of EudidymiteHide

Crystal Atlas:
Image Loading
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Eudidymite no.10 - 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)
0000043EudidymiteIto T (1947) The structure of eudidymite (HNaBeSi3O8) American Mineralogist 32 442-45319470293
0000293EudidymiteFang J H, Robinson P D, Ohya Y (1972) Redetermination of the crystal structure of eudidymite and its dimorphic relationship to epididymite American Mineralogist 57 1345-135419720293
0004615EudidymiteGatta G D, Rotiroti N, McIntyre G J, Guastoni A, Nestola F (2008) New insights into the crystal chemistry of epididymite and eudidymite from Malosa, Malawi: A single-crystal neutron diffraction study American Mineralogist 93 1158-11652008Malosa, Malawi0293
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
3.163 Å(10)
3.398 Å(8)
3.074 Å(8)
6.35 Å(6)
2.999 Å(6)
2.848 Å(6)
3.687 Å(5)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4a: Earth’s earliest continental crust>4.4-3.0
19 : Granitic intrusive rocks
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of EudidymiteHide

Type Locality:
ⓘ Eudidymite locality, Lille Arøya, Larvik, Vestfold, Norway
General Appearance of Type Material:
Tabular crystals, usually twinned on {001}
Chemical Analysis of Type Material:

Warning: A non-numeric value encountered in /home/mindat/www/show_class.php on line 1720
SiO273.11 %
BeO10.42 %
Na2O12.24 %
MgOtraces %
H2O3.79 %
Total:99.56 %
Geological Setting of Type Material:
Nepheline syenite
Associated Minerals at Type Locality:
NephelineNatroliteMolybdeniteK FeldsparFluorite
BiotiteAstrophylliteApophyllite GroupAnalcime
Reference:
Brøgger, W.C. (1887). Om ”Eudidymit”, et nyt norsk mineral. Forelöbig meddelelse. Nyt Magazin for Naturvidenskaberne, 31, 196-199
Download:
https://rruff.info/rruff_1.0/uploads/NMFN31_196.pdf

Other Language Names for EudidymiteHide

German:Eudidymit
Simplified Chinese:双晶石
Spanish:Eudidymita
Traditional Chinese:雙晶石

Common AssociatesHide

Associated Minerals Based on Photo Data:
61 photos of Eudidymite associated with AegirineNaFe3+Si2O6
34 photos of Eudidymite associated with EpididymiteNa2Be2Si6O15 · H2O
13 photos of Eudidymite associated with QuartzSiO2
12 photos of Eudidymite associated with MicroclineK(AlSi3O8)
12 photos of Eudidymite associated with Smoky QuartzSiO2
10 photos of Eudidymite associated with NatroliteNa2Al2Si3O10 · 2H2O
7 photos of Eudidymite associated with AnalcimeNa(AlSi2O6) · H2O
7 photos of Eudidymite associated with LeucophaniteNaCaBeSi2O6F
6 photos of Eudidymite associated with DolomiteCaMg(CO3)2
5 photos of Eudidymite associated with AlbiteNa(AlSi3O8)

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.08Plombièrite[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.30SørenseniteNa4SnBe2Si6O16(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.65ElpiditeNa2ZrSi6O15 · 3H2OOrth.
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 EudidymiteHide

References for EudidymiteHide

Reference List:
Brøgger, W.C. (1887) Om Eudidymit, et nyt norsk mineral. Foreløbig meddelelse [On Eudidymite, a new Norwegian mineral. Preliminary notice]. Nyt magazin for naturvidenskaberne [New magazine for the natural sciences], 31. Christiania [Oslo]. 196-199
Brøgger, Waldemar Christofer (1890, January) Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit-und Nephelinsyenite. Zeitschrift für Krystallographie und Mineralogie Vol. 16 (1) Walter de Gruyter GmbHpp.586-597
Flink, G (1899) Über einige seltene Mineralien aus der Gegend von Langesund in Norwegen [About some rare minerals from the Langesund area in Norway]. Bulletin of the Geological Institution of the University of Upsala, 4. 16-27
Palache, C. (1933) Crystallographic notes on anapaite, ainigmatite and eudidymite. Zeitschrift für Kristallographie-Crystalline Materials: 86(1-6): 280-291.
Ito, T. (1947) The structure of eudidymite (HNaBeSi3O8). American Mineralogist: 32: 442-453.
Shilin, L.L., Semenov, E.I. (1957) The beryllium minerals epididymite and eudidymite in alkaline pegmatites of the Kola Peninsula. Doklady Akademii Nauk SSSR: 112(2): 325-328.
Pobedimskaya, E., Belov, N.V. (1961) About the crystal structure of eudidymite NaBeSi3O7OH. Doklady Akademii Nauk SSSR: 136(6): 1448-1450.
Christophe Michel-Lévy, M. (1961) Remarques sur l'épididymite. Bulletin de Minéralogie: 84(3): 320-320.
Nickel, E. (1963) Eudidymite from Seal Lake, Labrador, Newfoundland. The Canadian Mineralogist, 7 (4) 643-649
Fang, J. H., Robinson, Paul D., Ohya, Y. (1972) Redetermination of the crystal structure of eudidymite and its dimorphic relationship to epididylnite. American Mineralogist, 57 (9-10) 1345-1354
Ginzburg, A.I., Novikova, M.I., Gal’chenko, V.I. (1979) Eudidymite in fluorite-bertrandite-phenakite deposits. Doklady Acad. Sci. USSR Earth Sci. Sections: 246: 151-154.
Shannon, Robert D., Shannon, Ruth C., Medenbach, Olaf, Fischer, Reinhard X. (2002) Refractive Index and Dispersion of Fluorides and Oxides. Journal of Physical and Chemical Reference Data, 31 (4) 931-970 doi:10.1063/1.1497384
Gatta, G. D., Rotiroti, N., McIntyre, G.J., Guastoni, A., Nestola, F. (2008) New insights into the crystal chemistry of epididymite and eudidymite from Malosa, Malawi: A single-crystal neutron diffraction study. American Mineralogist, 93 (7) 1158-1165 doi:10.2138/am.2008.2965
Larsen, Alf Olav, Andersen, Frode, Dahlgren, Sven, Larsen, Knut Edvard, Burvald, Ingulv - Ed. (2010) The Langesundsfjord - History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf. p.1-240.
Vegas, A., Jenkins, H.D.B. (2020) Rationalization of the crystal structure of eudidymite Na2Be2 [Si [4] 6O15]· H2O in light of the extended Zintl–Klemm concept. Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials: 76(1): 41-46.
(2023) Eudidymite. Handbook of Mineralogy. Mineralogical Society of America

Localities for EudidymiteHide

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.
Brazil
 
  • Goiás
    • Arenópolis
Orris et al. (2002)
Canada
 
  • Newfoundland and Labrador
    • Labrador
Nickel (1963) +1 other reference
GSC database locality No. 4100 +1 other reference
Cámara et al. (2013)
A. Kerr (2010)
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
166-175. +2 other references
Czech Republic
 
  • Vysočina Region
    • Žďár nad Sázavou District
      • Věžná
www.cseg.ca/conferences/2000/556.PDF. +2 other references
Canadian Mineralogist Vol.22 (1984) +1 other reference
Greenland
 
  • Kujalleq
    • Igaliku
      • Narsaarsuk Plateau
Bøggild (1953)
Petersen (2001)
Otter (2016)
Bull. Soc. Franç. Minéralo. ... +1 other reference
Malawi
 
  • Southern Region
    • Zomba
American Mineralogist +3 other references
Norway
 
RRUFF Project Specimen ID: R060063
  • Telemark
    • Porsgrunn
      • Auenlandet
        • Sagåsen
Larsen (1981)
Larsen et al. (2005)
      • Langangen
Larsen et al. (1976)
Raade et al. (1983)
Raade et al. (1983)
Engvoldsen et al. (1991)
      • Siktesøya
Larsen et al. (1991)
Larsen et al. (2010)
  • Vestfold
    • Færder
      • Færder Islands
Larsen et al. (2010) +1 other reference
    • Larvik
Collection of Naturhistoriska Riksmuseet i Stockholm (The Natural History Museum)
      • Hedrum
        • Lågendalen
Hansen (1981)
Andersen (1993)
      • Lille Arøya
Brøgger (1887) +2 other references
      • Malerød
Berge (1993) +1 other reference
      • Stavern (Fredriksvärn)
        • Jahren pegmatite
Andresen et al. (2018)
Andresen et al. (2018)
      • Tvedalen
Engvoldsen et al. (1991)
Engvoldsen et al. (1991)
Larsen (2016)
Larsen et al. (2010)
Larsen et al. (2010)
Nordrum (2004)
        • Tuften
Nordrum (2008) +1 other reference
Berge (n.d.) +2 other references
      • Vesle Arøya
Flink (1899) +2 other references
    • Sandefjord
      • Vesterøya
Larsen et al. (2010) +1 other reference
Engvoldsen et al. (1991)
Pakistan
 
  • Khyber Pakhtunkhwa Province
    • Peshawar District
      • Hameed Abad Kafoor Dheri
The Mineralogical Record
Russia
 
  • Buryatia
    • Kizhinginsky District
Pavel.M. Kartashov (n.d.) +1 other reference
    • Mama River Basin
      • Maigunda River
Vladykin et al. (2017)
  • Murmansk Oblast
    • Khibiny Massif
Pekov et al. (2004)
        • Kirovskii apatite mine
Pekov (2003)
    • Lovozersky District
      • Karnasurt Mountain
Pekov et al. (2007)
[World of Stones 95:5-6
Eur. J. Mineral 15 (2003)
Spain
 
  • Canary Islands
    • Santa Cruz de Tenerife Province
      • Tenerife
Dill et al. (2023)
UK
 
  • England
    • Devon
      • West Devon
        • Okehampton Hamlets
Kingsbury (1964) +3 other references
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