Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Green in various shades, ...
See also the related Steacyite Group.

Visit for gemological information about Ekanite.

Classification of Ekanite


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

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 : Silicates not Containing Aluminum
16 : Silicates of U

Physical Properties of Ekanite

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

Optical Data of Ekanite

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:

Chemical Properties of Ekanite

Elements listed in formula:
Common Impurities:

Crystallography of Ekanite

Crystal System:
Class (H-M):
4 2 2 - Trapezohedral
Space Group:
I4 2 2
Cell Parameters:
a = 7.483(3) Å, c = 14.893(6) Å
a:c = 1 : 1.99
Unit Cell Volume:
V 833.94 ų (Calculated from Unit Cell)
Very often metamict.
X-Ray Powder Diffraction Data:
7.45 (58)
6.70 (61)
4.14 (100)
3.343 (96)
3.265 (65)
2.642 (54)
1.796 (26)
Very often metamict.

Type Occurrence of Ekanite

Relationship of Ekanite to other Species

9.EA.15Fluorapophyllite-(K)KCa4Si8O20F · 8H2O
9.EA.15Hydroxyapophyllite-(K)KCa4Si8O20(OH,F) · 8H2O
9.EA.15Fluorapophyllite-(Na)NaCa4Si8O20F · 8H2O
9.EA.20MagadiiteNa2Si14O29 · 11H2O
9.EA.30Sazhinite-(Ce)Na3CeSi6O15 · 2H2O
9.EA.30Sazhinite-(La)Na3LaSi6O15 · 2H2O
9.EA.35ArmstrongiteCaZrSi6O15 · 2H2O
9.EA.40OkeniteCa10Si18O46 · 18H2O
9.EA.45NekoiteCa3Si6O15 · 7H2O
9.EA.50CavansiteCaV4+OSi4O10 · 4H2O
9.EA.55PentagoniteCaV4+OSi4O10 · 4H2O
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2O
9.EA.60TumchaiteNa2ZrSi4O11 · 2H2O
9.EA.65NabesiteNa2BeSi4O10 · 4H2O
9.EA.70AjoiteK3Cu202+Al3Si29O76(OH)16 · 8H2O
9.EA.75ZeravshaniteNa2Cs4Zr3Si18O45 · 2H2O
9.EA.85PlumbophyllitePb2Si4O10 · H2O
14.16.3Soddyite(UO2)2SiO4 · 2H2O
14.16.4Swamboite-(Nd)U6+(UO2)6(SiO3OH)6 · 30H2O
14.16.5WeeksiteK2(UO2)2(Si5O13) · 4H2O
14.16.6Boltwoodite(K,Na)UO2(SiO3OH) · 1.5H2O
14.16.7NatroboltwooditeNa(UO2)(SiO3OH) · H2O
14.16.8CuprosklodowskiteCu(UO2)2(SiO3OH)2 · 6H2O
14.16.9SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
14.16.10UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
14.16.11Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2O
14.16.12HaiweeiteCa(UO2)2Si5O12(OH)2 · 6H2O
14.16.13MetahaiweeiteCa(UO2)2Si6O15 · nH2O
14.16.17KasolitePb(UO2)SiO4 · H2O
14.16.18OrlitePb3(UO2)3(Si2O7)2 · 6H2O
14.16.19OursiniteCo(UO2)2(SiO3OH)2 · 6H2O

Other Names for Ekanite

Name in Other Languages:
Simplified Chinese:硅钙铀钍矿
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.

Chromy, B. (1973): The wee crystals. Earth Science, 1973, 227-278. [see]

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 URL:
Please feel free to link to this page.
The following Ekanite specimens are currently listed for sale on

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.
  • 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
    • 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.
  • 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.
  • 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.
    • Livorno Province
      • Campigliese (Campiglia Mountains; Campiglia Ridge)
        • Campiglia Marittima
Biagioni, C. (2016) Ekanite. Nuovi ritrovamenti a Botro ai Marmi, Campiglia Marittima (LI). Rivista Mineralogica Italiana, 40, 242-245.
  • Mandalay Region (Mandalay Division)
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Mogok Valley
Pavel M. Kartashov analytical data, Sieghard Ellenberger specimens
  • Azores District
    • São Miguel Island
      • Água de Pau Massif
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
Dissanayake, C. B., Chandrajith, R. O. H. A. N. A., & Tobschall, H. J. (2000). The geology, mineralogy and rare element geochemistry of the gem deposits of Sri Lanka. BULLETIN-GEOLOGICAL SOCIETY OF FINLAND, 72(1/2), 5-20.
      • Ratnapura
Nature 190 (1961), 997
  • Uva Province
    • Moneragala District
Dr. Jaroslav Hyrsl specimens; Mathavan, V., Kalubandara, S. T., & Fernando, G. W. A. R. (2000). Occurrences of two new types of gem deposits in Okkampitiya gem field in Sri Lanka.
  • California
    • Tulare Co.
      • Dumtah
Mineralogical Record: 34(2): 159-166
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 28, 2017 15:09:25 Page generated: April 28, 2017 14:13:07
Go to top of page