|
| ul·tra·maf·ic [ ùltrə máffik ] |
adjective |
|
| Definition: |
| |
with high ferromagnesian content: describes a dark igneous rock, over 90 percent of whose content consists of ferromagnesian minerals, including olivine and pyroxenes
|
noun (plural ul·tra·maf·ics) |
|
| Definition: |
| |
ultramafic rock: a rock of ultramafic composition
|
[
See also (all senses)ultrabasic] |
