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pyrauxite
pyrauxite n. 
/paɪˈrɑkˌsaɪt/ [after German Pyrauxit ( A. Breithaupt Vollständiges Handb. der Mineral. (1841) II. 397); so called because it swells when heated] Mineralogy rare = pyrophyllite n.
Brit. /pʌɪˈrɔːksʌɪt/
, /pʌɪˈrɔːksʌɪt/U.S. /paɪˈrɔkˌsaɪt/
, /paɪˈrɔkˌsaɪt//paɪˈrɑkˌsaɪt/ΚΠ
1868 J. D. Dana Syst. Mineral. (ed. 5) Index 821 Pyrauxite.
1955 Jrnl. Appl. Physics 6 326/1 Pyrophyllite found in other parts of the world is referred to by a variety of names such as pencil stone, agalmatolite and pyrauxite.
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