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pyroclasite
pyroclasite n. 
/ˌpʌɪrə(ʊ)ˈkleɪsʌɪt/, /pʌɪˈrɒkləsʌɪt/, /ˌpaɪroʊˈkleɪˌzaɪt/, /paɪˈrɑkləˌsaɪt/ [ < pyro- comb. form + ancient Greek κλάσις fracture (see -clase comb. form) + -ite suffix1, so called because it fractures violently when heated] Mineralogy (now historical and rare) a phosphate material occurring in hard guano, composed of fluorapatite and hydroxylapatite.
Brit. /ˌpʌɪrə(ʊ)ˈkleɪzʌɪt/
, /ˌpʌɪrə(ʊ)ˈkleɪzʌɪt//ˌpʌɪrə(ʊ)ˈkleɪsʌɪt//pʌɪˈrɒkləsʌɪt/U.S. /ˌpaɪroʊˈkleɪˌsaɪt/
, /ˌpaɪroʊˈkleɪˌsaɪt//ˌpaɪroʊˈkleɪˌzaɪt//paɪˈrɑkləˌsaɪt/ΚΠ
1856 C. U. Shepard in Amer. Jrnl. Sci. 22 97 The altered guano is composed..of two mineral species, which I have called pyroclasite and glaubapatite.
1882 Amer. Jrnl. Sci. 123 400 The substance..is undoubtedly identical with that from Monk's Island..named pyroclasite, from its very striking property of decrepitation when heated.
1943 Amer. Mineralogist 28 226 The physical properties and chemical composition of the original pyroclasite from Los Monges leave little doubt but that this mineral is a member of the apatite series.
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