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|System:||Tetragonal||Colour:||Green in various shades, ...|
See also the related Steacyite Group.
Visit gemdat.org for gemological information about Ekanite. Currently in public beta-test.
Classification of Ekanite
|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:||22.214.171.124|
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|
Crystallography of Ekanite
|Cell Parameters:||a = 7.48Å, c = 14.89Å|
|Ratio:||a:c = 1 : 1.991|
|Unit Cell Volume:||V 833.10 Å³ (Calculated from Unit Cell)|
Optical Data of Ekanite
|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.
Chemical Properties of Ekanite
|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|
Relationship of Ekanite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Ekanite
|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
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
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.