| 释义 |
greystone, graystone Min.|ˈgreɪstəʊn|
[f. grey a. + stone n.]
A grey volcanic rock, composed of feldspar (sometimes replaced by leucite or melilite), augite, or hornblende, and iron.
1815W. Phillips Outl. Min. & Geol. (1818) 151 Greystone according to Werner, is a mixture of white felspar and blackish hornblende. 1830Lyell Princ. Geol. I. 396 But lavas of composition precisely intermediate occur, and from their colour have been called graystones. |