ellestadite Min.
(ɛlɪˈstædaɪt)
[f. the name of R. B. Ellestad (b. 1900), American analytical chemist + -ite1.]
A halogen-containing mineral of the apatite group in which phosphorus is largely replaced by sulphur and silicon.
| 1937 D. McConnell in Amer. Mineralogist XXII. 977 The name ellestadite is proposed for the end-member of the apatite group which contains SiO4- and SO4-groups substituting for PO4-groups. 1959 P. F. Kerr Optical Min. (ed. 3) xii. 230 Fermorite, strontian apatite, and ellestadite are similar to apatite in physical properties. |