Ultramafic intrusive rocks consist of only
dark-coloured minerals, mostly pyroxene and olivine. Rocks composed almost entirely of
dark-coloured plagioclase (known as "anorthosites")are often associated with
ultramafic rocks.
Pyroxenite
Coarse olivine pyroxenite
Weathered ulramafic rock
Note: distinctive brown surface colour
Dark coloured anorthosite
Ultramafic rocks are often
altered to serpentinite.
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