ultramafic
美 [ˌʌltrə'mæfɪk]
英 [ʌltrə'mæfɪk]
- 网络超基性；超镁质；超基性岩
复数：ultramafics
adj. | 1. describes a dark igneous rock, over 90 percent of whose content consists of ferromagnesian minerals, including olivine and pyroxenes |
n. | 1. a rock of ultramafic composition |