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spongolite
spongolite n. 
/ˈspɑŋɡoʊˌlaɪt/ [ < French spongolithe (L. Cayeux 1897, in Mém. Soc. géol. du Nord IV. 99)] Geology a rock formed almost entirely of sponge spicules.
Brit. /ˈspɒŋɡə(ʊ)lʌɪt/
, /ˈspɒŋɡə(ʊ)lʌɪt/U.S. /ˈspɑŋɡəˌlaɪt/
, /ˈspɑŋɡəˌlaɪt//ˈspɑŋɡoʊˌlaɪt/ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > concretion or petrifaction > [noun] > specific
wood-stone1794
shell rock1807
petrified forest1830
biolith1852
dogger1876
spongolite1945
1945 M. F. Glaessner Princ. Micropalaeontol. ii. 23 Some rocks known as spongolites are largely formed of siliceous sponge spicules.
1963 Geol. Mag. 100 296 The Ardagh spongolites appear to have been laid down as a biohermal deposit.
1968 R. W. Fairbridge Encycl. Geomorphol. 780 In rare cases, sponge banks accumulate quite extensive deposits of siliceous spicules (spongolite or sometimes ‘spiculite’).
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