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Eudidymite

Big Photo

Lille Arøya (Midtre Arøy; Øvre Arøy; Övre-Arö), Langesundsfjorden, Larvik, Vestfold, Norway
© Knut Eldjarn

Show Eudidymite Photos (37)
Formula:
Na
 
2
Be
 
2
Si
 
6
O
 
15
·H
 
2
O
System:MonoclinicHardness:6
Name:From the Greek words for well and twinned, in allusion to its common occurrence in twins.
This page provides mineralogical data about Eudidymite.

Classification of Eudidymite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/G.04-10
Nickel-Strunz 10th (pending) edition ID:9.DG.60

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
Dana 8th edition ID: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
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Type Occurrence of Eudidymite

Type Locality:Lille Arøya (Midtre Arøy; Øvre Arøy; Övre-Arö), Langesundsfjorden, Larvik, Vestfold, Norway
Year of Discovery:1887

Physical Properties of Eudidymite

Hardness (Mohs):6

Crystallography of Eudidymite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
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 Volume:V 1265.47 ų
Z:4
Crystal Atlas:
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Eudidymite no.10 - Goldschmidt (1913-1926)

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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Eudidymite

Type:Biaxial (+)
RI values: nα = 1.545 nβ = 1.546 nγ = 1.551
2V:Measured: 30° , Calculated: 50°
Maximum Birefringence:δ = 0.006

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:r > v distinct

Chemical Properties of Eudidymite

Formula:
Na
 
2
Be
 
2
Si
 
6
O
 
15
·H
 
2
O
Essential elements:Be, H, Na, O, Si
All elements listed in formula:Be, H, Na, O, Si
Common Impurities:Al,Fe,Ca

Relationship of Eudidymite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DG.05Bustamite
(Mn
2+
 
,Ca)[SiO
 
3
]
9.DG.05Ferrobustamite
Ca(Fe
2+
 
,Ca,Mn
2+
 
)[Si
 
2
O
 
6
]
9.DG.05Pectolite
NaCa
 
2
[HSi
 
3
O
 
9
]
9.DG.05Sérandite
Na(Mn
2+
 
,Ca)
 
2
[HSi
 
3
O
 
9
]
9.DG.05Wollastonite
Ca[SiO
 
3
]
9.DG.05Wollastonite-1A
CaSiO
 
3
9.DG.07Cascandite
Ca(Sc,Fe
3+
 
)[HSi
 
3
O
 
9
]
9.DG.08Plombièrite
Ca
 
5
Si
 
6
O
 
16
(OH)
 
2
·7H
 
2
O
9.DG.10Clinotobermorite
Ca
 
5
[Si
 
3
O
 
8
(OH)
 
2
]2.4H
 
2
O - Ca
 
5
[Si
 
6
O
 
17
]·5H
 
2
O
9.DG.10Riversideite
Ca
 
5
Si
 
6
O
 
16
(OH)
 
2
·2H
 
2
O
9.DG.10Tobermorite
Ca
 
5
Si
 
6
(O,OH)
 
18
·5H
 
2
O
9.DG.15Foshagite
Ca
 
4
[(OH)
 
2
|Si
 
3
O
 
9
]
9.DG.20Jennite
Ca
 
9
H
 
2
Si
 
6
O
 
18
(OH)
 
8
·6H
 
2
O
9.DG.25Paraumbite
K
 
3
Zr
 
2
H(Si
 
3
O
 
9
)
 
2
·nH
 
2
O
9.DG.25Umbite
K
 
2
(Zr,Ti)Si
 
3
O
 
9
·H
 
2
O
9.DG.30Sørensenite
Na
 
4
SnBe
 
2
Si
 
6
O
 
16
(OH)
 
4
9.DG.35Xonotlite
Ca
 
6
Si
 
6
O
 
17
(OH)
 
2
9.DG.40Hillebrandite
Ca
 
2
[(OH)
 
2
|SiO
 
3
]
9.DG.45Zorite
Na
 
2
Ti(Si,Al)
 
3
O
 
9
·nH
 
2
O
9.DG.45Chivruaiite
Ca
 
3
Ti
 
5
[(Si
 
6
O
 
17
)
 
2
|O(OH)
 
4
]·14H
 
2
O
9.DG.50Haineaultite
(Na,Ca)
 
5
Ca(Ti,Nb)
 
5
[(OH,F)
 
4
|Si
 
6
O
 
17
]
 
2
 · 5H
 
2
O
9.DG.55Epididymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
·H
 
2
O
9.DG.65Elpidite
Na
 
2
ZrSi
 
6
O
 
15
·3H
 
2
O
9.DG.70Fenaksite
(K,Na)
 
4
(Fe,Mn)
 
2
(Si
 
4
O
 
10
)
 
2
(OH,F)
9.DG.70Litidionite
CuNaKSi
 
4
O
 
10
9.DG.70Manaksite
KNaMnSi
 
4
O
 
10
9.DG.75Tinaksite
K
 
2
Na(Ca,Mn
2+
 
)
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
9.DG.75Tokkoite
K
 
2
Ca
 
4
Si
 
7
O
 
17
(O,OH,F)
 
4
9.DG.75Senkevichite
CsKNaCa
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
9.DG.80Canasite
K
 
2
Na
 
4
Ca
 
5
(Si
 
12
O
 
30
(OH,F)
 
4
9.DG.80Fluorcanasite
K
 
3
Na
 
3
Ca
 
5
Si
 
12
O
 
30
F
 
4
·H
 
2
O
9.DG.85Miserite
K(Ca,Ce)
 
4
Si
 
5
O
 
13
(OH)
 
3
9.DG.90Frankamenite
K
 
3
Na
 
3
Ca
 
5
(Si
 
12
O
 
30
)[F,(OH)]
 
4
·H
 
2
O
9.DG.92Charoite
(K,Na)
 
5
(Ca,Ba,Sr)
 
8
(Si
 
6
O
 
15
)
 
2
(Si
 
6
O
 
16
)(OH,F)·H
 
2
O
9.DG.95Yuksporite
(K,Ba)NaCa
 
2
(Si,Ti)
 
4
O
 
11
(F,OH)·H
 
2
O
9.DG.97Eveslogite
(Na,K,Ca,Sr,Ba)
 
48
 [(Ti,Nb,Mn,Fe
2+
 
)
 
12
Si
 
48
O
 
144
(OH)
 
12
](F,OH,Cl)
 
14
Related Minerals - Hey's Index Grouping:

- +
14.3.1Phenakite
Be
 
2
[SiO
 
4
]
14.3.2Bertrandite
Be
 
4
[(OH)
 
2
|Si
 
2
O
 
7
]
14.3.3Beryllite
Be
 
3
[(OH)
 
2
|SiO
 
4
] · H
 
2
O
14.3.4Liberite
Li
 
2
Be[SiO
 
4
]
14.3.5Chkalovite
Na
 
2
BeSi
 
2
O
 
6
14.3.7Epididymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
·H
 
2
O
14.3.8Gugiaite
Ca
 
2
Be[Si
 
2
O
 
7
]
14.3.9Jeffreyite
(Ca,Na)
 
2
(Be,Al)[Si
 
2
O
 
6
(O,OH)]
14.3.10Semenovite-(Ce)
Na
 
8
Ca
 
2
FeBe
 
6
Ce
 
2
Si
 
14
O
 
40
(OH)
 
4
F
 
4
14.3.11Barylite
BaBe
 
2
[Si
 
2
O
 
7
]
14.3.12Hingganite-(Ce)
(Ce,REE)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.13Hingganite-(Yb)
(Yb,Y,REE)
 
2
□Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.14Hingganite-(Y)
(Y,REE,Ca)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.15Minasgeraisite-(Y)
Y
 
2
CaBe
 
2
[O|SiO
 
4
]
 
2
14.3.16Sørensenite
Na
 
4
SnBe
 
2
Si
 
6
O
 
16
(OH)
 
4
14.3.17Trimerite
CaMn
2+
2
Be
 
3
[SiO
 
4
]
 
3
14.3.18Chiavennite
CaMnBe
 
2
Si
 
5
O
 
13
(OH)
 
2
·2H
 
2
O
14.3.19Tvedalite
(Ca,Mn)
 
4
Be
 
3
Si
 
6
O
 
17
(OH)
 
4
·3H
 
2
O
14.3.20Harstigite
Ca
 
6
(Mn,Mg)Be
 
4
Si
 
6
(O,OH)
 
24
14.3.21Sverigeite
NaMnMgSnBe
 
2
Si
 
3
O
 
12
(OH)
14.3.22Joesmithite
PbCa
 
2
Mg
 
3
Fe
3+
2
[Si
 
6
Be
 
2
O
 
22
](OH)
 
2
14.3.23Gadolinite-(Y)
Y
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
14.3.24Gadolinite-(Ce)
(Ce,La,Nd,Y)
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
14.3.25Calciogadolinite-(Y)
(YCa)
 
2
Fe
3+
 
Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2

Other Names for Eudidymite

Other Languages:
German:Eudidymit
Russian:Эвдидимит
Spanish:Eudidymita

Other Information

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

References for Eudidymite

Reference List:American Mineralogist: 57: 1345-1354.

Diego Gatta, G., N. Rotiroti, G.J.McIntyre, A. Guastoni, & F. Nestola (2008): New insights into the crystal chemistry of euididymite and eudidymite from Molosa, Malawi: A single-crystal neutron diffraction study: Am. Min. 93,1158-1165.

Internet Links for Eudidymite

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    Localities for Eudidymite

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Brazil
     
    • Central-West Region
      • Goiás
        • Arenópolis
    		Orris, G.J., and Grauch, R.I. (2002): USGS Open-File Report 02-189.
    Canada
     
    • Newfoundland and Labrador
      • Labrador
    		\"Rare Earth Element Mines, Deposits, and Occurrences,\" G.J. Orris and R.I. Grauch, Open File Report 02-189, U.S. Department of the Interior, U.S. Geological Survey, 2002.
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Žďár nad Sázavou
          • Věžná
    		www.cseg.ca/conferences/2000/556.PDF.
    Petr Pauliš (2001): Nejzajímavější mineralogická naleziště Moravy a Slezska. Kuttna, Kutná Hora.
    Greenland
     
    • Kitaa (West Greenland) Province
      • Narsaq
        • Igaliku (Igaliko)
          • Narssârssuk (Narsarsuk)
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 292.
        • Ilimaussaq complex
          • Tasseq area
    		Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, pp. 510.; Bohse, H., Petersen, O., Niedermayr, G. (2001): Notes on Leucophanite from the Ilimaussaq alkaline complex, South Greenland, Geology of Greenland Survey Bulletin, 190, 119-121
    Malawi
     
    • Zomba District
    		Cairncross, B., Messner, K & Farquharson, E. (1999): Die Pegmatite des Mount Malosa bei Zomba, Malawi. LAPIS 24 (4), 22-32; American Mineralogist, Volume 94, pages 1216–1222, 2009
    Norway
     
      • Porsgrunn
        • Langangen
          • Kokkersvold - Blåfjell
    		Larsen, A. O. & Åsheim, A.(1976): Mineraler fra Langangen. NAGS-nytt 3(1),9-12. ;Am Min 68:5-6 pp 628-633
        • Langesundsfjorden
    		Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
          • Siktesøya
    		Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
        • Mørje
          • Sagåsen (Strandåsen)
    		Larsen, A.O. (1981): Boehmite from syenite pegmatites in the Oslo region, Norway. Mineralogical Record 12, 227-230
    A. O. Larsen, A. Åsheim and R. A. Gault, 2005.
    • Vestfold
      • Larvik
        • Hedrum
          • Lågendalen
    		Hansen,R.(1981)."Mineralnotater". NAGS-nytt 8(4),18 (in norwegian)
    Andersen, F. (1993): Hedrum pukkverk i Lågendalen. STEIN 20 (4), 236-238
        • Langesundsfjorden
    		Brøgger (1890a and 1890c, pp. 586-597); Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 284; Raade (1996, p. 36).
          • Vesle Arøya
    		Engvoldsen, T., Andersen, F., Berge, S. A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18 (1), 15-71
        • Tvedalen
    		Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
    Nordrum, F. S. (2004): Nyfunn av mineraler i Norge 2003-2004. STEIN 31 (2), 36-44
    Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
    Collection of Alf Olav Larsen.
          • Tuften (Tuften 1 Quarry; Tuften 2 Quarry)
    		Collection of Peter Andresen./ Nordrum, F.S. (2008): Nyfunn av mineraler i Norge 2007-2008. STEIN 35 (2), 8-20
    Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
        • Vardaasen
    		Andersen, F., Berge, S.A. & Burvald, I. (1996): Die Mineralien des Langesundsfjords und des umgebenden Larvikit-Gebietes, Oslo-Region, Norwegen. Mineralien-Welt 7(4), 21-100
      • Sandefjord
        • Vesterøya
    		Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
    Pakistan
     
    • Federally Administered Tribal Areas (FATA)
      • Khyber Agency
        • Mulla Ghori
    		The Mineralogical Record, Volume 35 Number 3, p. 212
    Russia
     
    • Eastern-Siberian Region
      • Transbaikalia (Zabaykalye)
        • Buriatia (Buryatia) Republic
    		Pavel M. Kartashov data
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		Pekov, I.V. & Podlesnyi, A.S. (2004): Kukisvumchorr Deposit: Mineralogy of Alkaline Pegmatites and Hydrotermalites. Mineralogical Almanac, vol. 7, 140 pages + xxiv photo's pages
          • Lovozero Massif
    		[World of Stones 95:5-6, p64]
    Eur. J. Mineral 15,157-166 (2003)
    UK
     
    • England
      • Devon
        • Okehampton area (Northern Dartmoor)
    Mineral and/or Locality
    Google
     
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