Harzburgite
“A slice of the upper mantle”
Harzburgite is an ultramafic rock composed primarily of olivine and orthopyroxene, representing depleted mantle material from which basaltic magma has already been extracted. It's one of the most common rock types in Earth's upper mantle and frequently appears at the surface in ophiolite complexes.
olivine, orthopyroxene (enstatite), chromite (accessory), spinel
Harz Mountains (Germany), Oman Ophiolite, Troodos (Cyprus), Bay of Islands (Newfoundland), Papua New Guinea
6-6.5
The enormous Samail Ophiolite in Oman contains vast exposures of harzburgite — it's the largest and best-exposed piece of oceanic mantle on Earth's surface.
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