Sphene, Sri Lanka's newest gemstone
Scripta Geologica , Volume 58 p. 1- 11
Three cut sphenes, originating from the Tissamaharama area in Sri Lanka, are described. Their properties are compared with those of gem quality sphenes from Capelinha, Brazil. There is hardly any difference between the chemical data of the major elements and physical properties of the specimens of these two sources. Even the inclusions are very similar. It is the first time that fine gem quality sphene has been reported from Sri Lanka.
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Zwaan, P.C, & Arps, C.E.S. (1980). Sphene, Sri Lanka's newest gemstone. Scripta Geologica, 58, 1–11.