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protoenstatite
protoenstatite n.
Brit. 
/ˌprəʊtəʊˈɛnstətʌɪt/
, /ˌprəʊtəʊˈɛnstətʌɪt/U.S. /ˌproʊdoʊˈɛnstəˌtaɪt/
[after German Protoenstatit (1938 or earlier)] Mineralogy an artificial mineral which is a high-temperature polymorph of the magnesium silicate mineral enstatite, MgSiO3./ˌproʊdoʊˈɛnstəˌtaɪt/ΘΚΠ
the world > the earth > minerals > types of mineral > silicates > inosilicates single chain > [noun] > pyroxene > orthopyroxene > varieties
hypersthene1808
paulite1814
szaboite1883
shattuckite1915
protoenstatite1939
1939 Jrnl. Amer. Ceramic Soc. 18 110/1 Constitution of steatite... On heating to 800°, talc lost its H2O and was transformed into protoenstatite.
1965 L. Bragg et al. Crystal Struct. Min. xii. 236 In protoenstatite the chains are fully extended, whereas in enstatite and clinoenstatite they are slightly different in shape and not fully extended.
2006 Ceramics Internat. 32 408/2 The XRD pattern..confirmed that sintered sample contains protoenstatite, cristobalite, and spinel.
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