| 释义 |
Tschermak Min.|ˈtʃɜːmæk|
The name of Gustav Tschermak (1836–1927), Austrian mineralogist, used attrib. and in the possessive to designate the synthetic pyroxene CaAl(AlSi)O6 as a hypothetical component of natural pyroxenes, or the part Al(AlSi)O6 of this.
1943Amer. Mineralogist XXVIII. 73 The substitution Al2/MgSi is that by which the ‘Tschermak molecule’ is derived from diopside. 1962Jrnl. Petrol. III. 355 The Cs may also be traced to the Tschermak's molecule in the high-CaO titaniferous clinopyroxene. 1970Nature 26 Sept. 1337/1 Omphacite (diopsidic clinopyroxene in which jadeite predominates over Tschermak's molecule). 1974Encycl. Brit. Macropædia XV. 322/1 Ferric diopsides contain ferri-Tschermak's molecule (CaFe2SiO6).
Hence ˈtschermakite, an amphibole end-member of the hornblende group, Ca2Mg3Al4Si6O22(OH)2, that is rich in aluminium; also, any member of the series this forms with ferrotschermakite (the other end-member). Hence tschermaˈkitic a.
1945A. N. Winchell in Amer. Mineralogist XXX. 29 Hallimond notes that the second of these formulas is often called the Tschermak molecule; the writer would suggest that it be called tschermakite. 1963W. A. Deer et al. Rock-Forming Minerals III. 272 Tschermakitic hornblendes. 1966― Introd. Rock-Forming Minerals ii. 168 Compositions approaching those of the edenite and tschermakite end-members are rare, and the compositions of the majority of the hornblendic amphiboles are intermediate between the two end-member series, tremolite—ferroactinolite and pargasite—ferrohastingsite. 1976Nature 22 Apr. 673/2 The generally tschermakitic-pargasitic nature of all the amphiboles is like that of amphiboles produced synthetically from hydrous basaltic melts. |