| 释义 |
kolm Petrogr.|kɒlm|
[Sw.]
(See quot. 1954.)
1930Jrnl. Amer. Chem. Soc. LII. 4848 The ash of the kolm constitutes from 20 to 40% of the original, and contains a few hundredths of a per cent. of lead. 1954S. I. Tomkeieff Coals & Bitumens 61/1 Kolm, variety of cannel coal occurring locally as lenticles in Swedish alum shales, and containing 30% of ash rich in rare metals, including uranium and radium. 1969M. G. Rutten Geol. W. Europe iii. 44 Within these black shales lenses may occur of a sort of coal, the ‘kolm’. Both shales and kolm have in recent times acquired importance for their uranium content. |