| 释义 |
missourite Petrogr.|mɪs-, mɪˈzʊəraɪt|
[f. Missouri + -ite1 (see quot. 1896).]
A grey, granular, igneous rock composed mainly of pyroxene, leucite, and sometimes olivine.
1896Weed & Pirsson in Amer. Jrnl. Sci. II. 323 This rock is a new type, and it fills a place which has hitherto been vacant in all systems of rock classification... We have therefore called it missourite from the Missouri River, the most prominent and best known geographical object in the region where it occurs. 1927Ibid. XIV. 179 These granitoid augite-leucite rocks will be called missourite, although Pirsson's original Montana missourite contained less leucite and about 15 per cent of olivine. Ibid. 180 The presence of olivine in missourite need not be regarded as essential. 1963Mineral. Abstr. XVI. 388/1 The first missourites recorded from Russia are in an outcrop of alkaline gabbroic rocks near the Lomachan River. |