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Ekanite

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Formula:
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
System:TetragonalColour:Green in various shades, ...
Hardness:


See also the related Steacyite Group.

Visit gemdat.org for gemological information about Ekanite. Currently in public beta-test.

Classification of Ekanite

IMA status:Approved
Strunz 8th edition ID:8/E.10-10
Nickel-Strunz 10th (pending) edition ID:9.EA.10

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
Dana 8th edition ID:72.1.1.1

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
1 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Hey's CIM Ref.:14.16.16

14 : Silicates not Containing Aluminum
16 : Silicates of U
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Type Occurrence of Ekanite

Type Locality:Ehiliyagoda (Ehaliyagoda), Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Year of Discovery:1961

Physical Properties of Ekanite

Colour:Green in various shades, straw-yellow, dark red
Hardness (Mohs):

Crystallography of Ekanite

Crystal System:Tetragonal
Cell Parameters:a = 7.48Å, c = 14.89Å
Ratio:a:c = 1 : 1.991
Unit Cell Volume:V 833.10 ų (Calculated from Unit Cell)

Optical Data of Ekanite

Type:Uniaxial (-)
RI values: nω = 1.580 nε = 1.568
Maximum Birefringence:δ = 0.012

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

Chemical Properties of Ekanite

Formula:
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
Simplified for copy/paste:(Ca,Fe2+,Pb)2(Th,U)[Si8O20]
Essential elements:Ca, O, Si, Th
All elements listed in formula:Ca, Fe, O, Pb, Si, Th, U
Common Impurities:U,Fe,Pb,Al,Mn,Pb,Mg

Relationship of Ekanite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EA.05Cuprorivaite
CaCu[Si
 
4
O
 
10
]
9.EA.05Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
9.EA.05Effenbergerite
BaCu[Si
 
4
O
 
10
]
9.EA.05Wesselsite
SrCu[Si
 
4
O
 
10
]
9.EA.15Fluorapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
9.EA.15Hydroxyapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
9.EA.15Fluorapophyllite-(Na)
NaCa
 
4
(Si
 
8
O
 
20
)F · 8H
 
2
O
9.EA.20Magadiite
Na
 
2
Si
 
14
O
 
29
· 11H
 
2
O
9.EA.25Dalyite
K
 
2
ZrSi
 
6
O
 
15
9.EA.25Davanite
K
 
2
TiSi
 
6
O
 
15
9.EA.30Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
9.EA.30Sazhinite-(La)
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
9.EA.35Armstrongite
CaZr[Si
 
6
O
 
15
] · 3H
 
2
O
9.EA.40Okenite
CaSi
 
2
O
 
5
· 2H
 
2
O
9.EA.45Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
9.EA.50Cavansite
Ca(VO)Si
 
4
O
 
10
· 4H
 
2
O
9.EA.55Pentagonite
Ca(VO)Si
 
4
O
 
10
· 4H
 
2
O
9.EA.60Penkvilksite
Na
 
4
Ti
 
2
Si
 
8
O
 
22
· 4H
 
2
O
9.EA.60Tumchaite
Na
 
2
Zr(Si
 
4
O
 
11
) · 2H
 
2
O
9.EA.65Nabesite
Na
 
2
BeSi
 
4
O
 
10
· 4H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
AlSi
 
9
O
 
24
(OH)
 
6
· 3H
 
2
O
9.EA.75Zeravshanite
Na
 
2
Cs
 
4
Zr
 
3
[Si
 
18
O
 
45
]*2H
 
2
O
9.EA.80Bussyite-(Ce)
(Ce,REE)
 
3
(Na,H
 
2
O)
 
6
MnSi
 
9
Be
 
5
(O,OH)
 
30
F
 
4
9.EA.85Plumbophyllite
Pb
 
2
Si
 
4
O
 
10
· H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.16.1Uranosilite
UO
 
3
· 7SiO
 
2
14.16.2Coffinite
(U
4+
 
,Th)(SiO
 
4
)
 
1-x
(OH)
 
4x
14.16.3Soddyite
(UO
 
2
)
 
2
SiO
 
4
· 2H
 
2
O
14.16.4Swamboite
UH
 
6
(UO
 
2
)
 
6
(SiO
 
4
)
 
6
· 30H
 
2
O
14.16.5Weeksite
K
 
2
(UO
 
2
)
 
2
(Si
 
5
O
 
13
) · 4H
 
2
O
14.16.6Boltwoodite
(K,Na)(UO
 
2
)[HSiO
 
4
] · 0.5H
 
2
O
14.16.7Natroboltwoodite
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
· H
 
2
O
14.16.8Cuprosklodowskite
Cu(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 6H
 
2
O
14.16.9Sklodowskite
Mg(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 5H
 
2
O
14.16.10Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 5H
 
2
O
14.16.11β-Uranophane
Ca(UO
 
2
)
 
2
(HSiO
 
4
)
 
2
· 5H
 
2
O
14.16.12Haiweeite
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
] · 6H
 
2
O
14.16.13Metahaiweeite
Ca(UO
 
2
)
 
2
Si
 
6
O
 
15
· nH
 
2
O
14.16.14Thorogummite
(Th,U)(SiO
 
4
)
 
1-x
(OH)
 
4x
14.16.15Steacyite
(◻,K)(Na,Ca)
 
2
(Th,U)[Si
 
8
O
 
20
]
14.16.17Kasolite
Pb(UO
 
2
)[SiO
 
4
] · H
 
2
O
14.16.18Orlite
Pb
 
3
(UO
 
2
)
 
3
(Si
 
2
O
 
7
)
 
2
· 6H
 
2
O
14.16.19Oursinite
(Co,Mg)(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 6H
 
2
O

Other Names for Ekanite

Other Languages:
German:Ekanit
Russian:Эканит
Simplified Chinese:硅钙铀钍矿
Spanish:Ekanita
Traditional Chinese:矽鈣鈾釷礦

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 Ekanite

Reference List:

- +
ANDERSON, B.W., CLARINGBULL, G.F., DAVIS, R.J. & HILL, D.K. (1961): Ekanite, a new metamict mineral from Ceylon. Nature 190, 997.
GÜBELIN, E.J. (1962) Ekanite. The Gemmologist, 31(No. 373), 142-152, (No. 374),165-169.
SZYMAŃSKI, J.T., OWENS, D.R., ROBERTS, A.C., ANSELL, H.G. & CHAO, G.Y. (1982): A mineralogical study and crystal structure determination of nonmetamict ekanite ThCa2Si8O20. Canadian Mineralogist 20, 65 75.
PERRAULT, G. & SZYMAŃSKI, J.T. (1982): Steacyite, a new name and a re evaluation of the nomenclature of "ekanite" group minerals. Canadian Mineralogist 20, 59 63.
Della Ventura, G., Maras, A. & Parodi, G. C. (1986): Nonmetamict U-rich ekanite from Pitigliano (Tuscany, Italy). Atti della Accademia Nazionale dei Lincei, Rendiconti, Classe di Scienze Fisiche, Matematiche e Naturali 80, 585-592.

Internet Links for Ekanite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Ekanite details from Handbook of Mineralogy (PDF)
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  • Specimens:The following Ekanite specimens are currently listed for sale on minfind.com.

    Localities for Ekanite

    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.
    Burma (Myanmar)
     
    • Mandalay Division
      • Pyin-Oo-Lwin District
        • Mogok Township
          • Mogok Valley
    Pavel M. Kartashov analytical data, Sieghard Ellenberger specimens
    Canada
     
    • Québec
      • Abitibi-Témiscamingue
        • Témiscamingue RCM
          • Les Lacs-du-Témiscamingue
    GSC database: XRD only; metamict
      • Montérégie
        • La Vallée-du-Richelieu RCM
          • Mont Saint-Hilaire
    Richard A.J. (1971), La methode d'addition symbolique et la definition de la structure cristalline de l'ekanite de St-Hilaire, P.Q. Ph.D. Thesis, Ecole polytechnique de Montréal, Canada; Perrault G. and Richard P. (1973), L'ekanite de St-Hilaire, P.Q. Canadian Mineralogist: 11: 913-929.
    • Yukon Territory
      • Dawson Mining District
    Szymansky et al. & Perrault et al. Can. Min. 20, 59 & 65.
    SZYMAŃSKI, J.T., OWENS, D.R., ROBERTS, A.C., ANSELL, H.G. & CHAO, G.Y. (1982): A mineralogical study and crystal structure determination of nonmetamict ekanite ThCa2Si8O20. Canadian Mineralogist 20, 65 75.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Waldshut
          • Detzeln
    Hess, E., Graeser, S. & Gabriel, W. (2011): Das Porphyrwerk Detzeln im Steinatal und seine Mineralien. Lapis 36 (4), 25-35; 54.
    Italy
     
    • Latium
      • Rome Province
    Caponera, I., Fiori, S., Pucci, R., & Signoretti, E. (2007). I minerali dei Colli Albani. Un aggiornamento sugli ultimi dieci anni di ricerche. Rivista Mineralogica Italiana, 31 (2), 74-91.
          • Albano Laziale
    Gianfagna, A., Merlino, S., Perchiazzi, N. (1988). Guarinite, a new finding in the sanidinite ejecta of the IV Hydromagmatic Unit from Albano lake crater, Latium, Italy. Periodico di Mineralogia, 57: 81-84.
        • Rome
    Gresta, S., Duronio, F., Mancinella D. (2002): Geositi e Sistema delle Aree Protette del Lazio: idee per la geoconservazione. Il Cercapietre. Not. del Gruppo Mineralogico Romano, 1-2: 48-55
      • Viterbo Province
        • Vico Lake
    No reference listed
    • Lombardy
      • Sondrio Province
    Lapis, 19 (10), 15-21+86.
    • Tuscany
      • Grosseto Province
        • Pitigliano
    Liotti L., 1991. I minerali dei vulcani laziali a Pitigliano (Grosseto). Riv. Mineral. Ital., 15: 121-139.
    Sri Lanka
     
    • Sabaragamuwa Province
      • Ratnapura District
        • Ratnapura
    Nature 190 (1961), 997
    • Uva Province
      • Moneragala District
    Dr. Jaroslav Hyrsl specimens
    USA
     
    • California
      • Tulare Co.
        • Dumtah
    Mineralogical Record: 34(2): 159-166
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