Ekanite Value, Price, and Jewelry Information


EKANITE: Sri Lanka (~ 0.5). Photo © Joel E. Arem, PhD, FGA. Used with permission.

Ekanite is metamict as a result of the U and Th content. The properties vary, depending on the degree of breakdown of the structure. Ekanite is one of the very rarest of all gems, and only a few are known. More undoubtedly exist that have been sold as other Sri Lankan gems, but the total number of gems is a mere handful.

Ekanite Value

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Ekanite Information

DataValue
NameEkanite
Crystallography Tetragonal. Crystals elongated parallel to long crystal axis; massive pebbles.
Colors Green, dark brown, light brown, emerald green.
Luster Vitreous
Hardness 5-6.5
Specific Gravity 3.28-3.32
Birefringence 0.001
Cleavage None
Stone SizesA stone was tested by the London Gem Labs in 1975: 43.8 carats, blackish color, S.G. = 3.288, R.I. = 1.595 (average); radioactive; 2 spectral lines seen. A 351 carat rough has also been reported.
Luminescence Not diagnostic.
Spectral May show lines at 6300 and 6580.
Formula(Th,U)(Ca,Fe,Pb)2Si8O20.

Opticso = 1.573; e = 1.572.

Uniaxial ( – ). Gems usually  1.590-1.596.

Occurrence: Discovered in 1953 as waterworn, translucent green pebbles at Eheliyagoda, near Ratnapura, Sri Lanka. Occurs in the gem gravels. Some cut Sri Lankan stones have 4-rayed stars. Mt. Ste. Hilaire. Quebec, Canada.

Central Asia.

Comments: Ekanite is metamict as a result of the U and Th content. The properties vary, depending on the degree of breakdown of the structure. Ekanite is one of the very rarest of all gems, and only a few are known. More undoubtedly exist that have been sold as other Sri Lankan gems, but the total number of gems is a mere handful.

Name: After E L. D. Ekanayake who first found it in a Sri Lankan gravel pit.