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ptilolite
ptilolite n. 
/ˈtʌɪlə(ʊ)lʌɪt/, /ˈtaɪləˌlaɪt/ Mineralogy (now historical) a mineral now recognized as identical with mordenite.
Brit. /ˈtɪlə(ʊ)lʌɪt/
, /ˈtɪlə(ʊ)lʌɪt//ˈtʌɪlə(ʊ)lʌɪt/U.S. /ˈtɪləˌlaɪt/
, /ˈtɪləˌlaɪt//ˈtaɪləˌlaɪt/ΚΠ
1886 W. Cross & L. G. Eakins in Amer. Jrnl. Sci. 32 118 Ptilolite, derived from πτίλον, down, in reference to the light, downy nature of its aggregates.
1934 Mineral Mag. 23 559 The minerals examined..are essentially high-silica heulandites, without any simple relation to mordenite or ptilolite.
1965 G. J. Williams Econ. Geol. N.Z. xiv. 230/1 Ptilolite, laumonite and stibnite were commonly reported from the propylites of the Hauraki gold field.
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as lemmas