Cyprus is one of the few places where rocks from the mantle crop out at the surface. They are not part of the mantle anymore, of course, but they were during the formation. Seeing mantle rocks and walking through moho (boundary between the crust and the mantle) should definitely be in every geologists lifetime list. I am very glad I did it today.
Me holding a piece of the mantle (harzburgite) in my hand.
Harzburgite is the main rock type of the deepest exposed sections. Harzburgite is a peridotite (ultramafic rock) that is composed of olivine (brown) and orthopyroxene (greenish brown reflective crystals) with minor chromite. Harzburgite is a residue of partial melting (take basalt or gabbro out of the mantle and harzburgite is what remains).
Dunite is an ultramafic rock that is composed almost exclusively of olivine. Dunites here usually contain some orthopyroxene as well and there seems to be a gradational transition from dunite to harzburgite.
Orthopyroxenite (ultramafic rock that contains almost only orthopyroxene) forms layers in dunite and harzburgite. Here is orthopyroxenite layer on top of dunite block.
Littlebit higher (stratigraphically but also topographically) there is a boundary between the crust and the mantle (moho) which is represented by layered cumulates.
All the rock types are partly hydrothermally altered (serpentinized). Here is a block of serpentinite on top of harzburgite.