What does utrabasic mean in geology ?
Ultrabasic : definition
Said of an igneous rock containing less than 45% silica and particularly rich in ferromagnesian minerals (olivines, pyroxenes, amphiboles...).
The term "ultramafic" is considered synonymous although some authors propose to restrict it to only grainy ultrabasic rocks (such as peridotites).
The term "ultramafic" is considered synonymous although some authors propose to restrict it to only grainy ultrabasic rocks (such as peridotites).