| 释义 |
harmotome Min.|ˈhɑːmətəʊm|
Also erron. harmotone.
[a. F. harmotome (Haüy), f. Gr. ἁρµός joint + -τοµος cutting; app. in reference to the fact that the octahedron divides parallel to the plane that passes through the terminal edges.]
A hydrous silicate of aluminium and barium, commonly occurring in cruciform twin crystals of various colours. Also called cross-stone.
1804R. Jameson Syst. Min. I. 222 Cross-stone..Harmotome. Haüy. 1851Richardson Geol. ii. (1855) 25 An especial value was assigned to the mineral harmotome, or cross-stone, on account of the sacred emblem of which it was supposed to be the type. 1881Cassell's Pop. Educ. VI. 333 Harmotone..being frequently found in twin crystals or macles, so regular as to form in section a Maltese cross. |