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Ekanite

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Formula:
(Ca,Fe2+,Pb)2(Th,U)[Si8O20]
System:
Tetragonal
Colour:
Green in various shades, ...
Hardness:
See also the related Steacyite Group.

Visit gemdat.org for gemological information about Ekanite.

Classification of Ekanite

Approved
9.EA.10

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
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
14.16.16

14 : Silicates not Containing Aluminum
16 : Silicates of U
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First Recorded Occurrence of Ekanite

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
Max Birefringence:
δ = 0.012
Image 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,Fe2+,Pb)2(Th,U)[Si8O20]
Essential elements:
All elements listed in formula:
Common Impurities:
U,Fe,Pb,Al,Mn,Pb,Mg

Relationship of Ekanite to other Species

9.EA.05CuprorivaiteCaCu[Si4O10]
9.EA.05GillespiteBaFe2+[Si4O10]
9.EA.05EffenbergeriteBaCu[Si4O10]
9.EA.05WesselsiteSrCu[Si4O10]
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2O
9.EA.20MagadiiteNa2Si14O29 · 11H2O
9.EA.25DalyiteK2ZrSi6O15
9.EA.25DavaniteK2TiSi6O15
9.EA.30Sazhinite-(Ce)Na3Ce[Si6O15] · 6H2O
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2O
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2O
9.EA.40OkeniteCaSi2O5 · 2H2O
9.EA.45NekoiteCa3Si6O15·7H2O
9.EA.50CavansiteCa(VO)Si4O10 · 4H2O
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2O
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2O
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2O
9.EA.65NabesiteNa2BeSi4O10 · 4H2O
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2O
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2O
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4
9.EA.85PlumbophyllitePb2Si4O10 · H2O
14.16.1UranosiliteUO3 · 7SiO2
14.16.2Coffinite(U4+,Th)(SiO4)1-x(OH)4x
14.16.3Soddyite(UO2)2SiO4 · 2H2O
14.16.4SwamboiteUH6(UO2)6(SiO4)6 · 30H2O
14.16.5WeeksiteK2(UO2)2(Si5O13) · 4H2O
14.16.6Boltwoodite(K,Na)(UO2)[HSiO4] · 0.5H2O
14.16.7Natroboltwoodite(H3O)(Na,K)UO2SiO4 · H2O
14.16.8CuprosklodowskiteCu(UO2)2[HSiO4]2 · 6H2O
14.16.9SklodowskiteMg(UO2)2[HSiO4]2 · 5H2O
14.16.10UranophaneCa(UO2)2[HSiO4]2 · 5H2O
14.16.11Uranophane-βCa(UO2)2(HSiO4)2 · 5H2O
14.16.12HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2O
14.16.13MetahaiweeiteCa(UO2)2Si6O15 · nH2O
14.16.15Steacyite(◻,K)(Na,Ca)2(Th,U)[Si8O20]
14.16.17KasolitePb(UO2)[SiO4] · H2O
14.16.18OrlitePb3(UO2)3(Si2O7)2 · 6H2O
14.16.19Oursinite(Co,Mg)(UO2)2[HSiO4]2 · 6H2O

Other Names for Ekanite

Name in 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 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 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

Specimens:
The following Ekanite specimens are currently listed for sale on minfind.com.

Localities for Ekanite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
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.
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
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
        • Monte Somma
          • Ercolano
            • San Vito
Russo, M., Campostrini, I., Demartin, F. (2013). Nuove specie minerali al Monte Somma: V. L'ekanite. Micro, 3/2013, 142-144
  • 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
      • Valtellina
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.
Portugal
 
  • Azores District
    • San Miguel Island
Samples collected by Luigi Chiappino and analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA
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
Mineral and/or Locality  
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