One type of these substances forms in rock consisting of olivine and pyroxene, a basic rock known as peridotite. In addition to the harzburgitic variety, an eclogitic variety forms from the organic detritus pushed down by sub
One type of these substances forms in rock consisting of olivine and pyroxene, a basic rock known as peridotite. In addition to the harzburgitic variety, an eclogitic variety forms from the organic detritus pushed down by subduction. They are usually found in a blue igneous rock which forms at pipes and is called kimberlite, and calcite crystals mistaken for these substances were found in a volcanic tuff cone in Hawaii, a namesake "Head." For 10 points, name this allotrope of carbon, the hardest known naturally- occurring mineral.
One type of these substances forms in rock consisting of olivine and pyroxene, a basic rock known as peridotite.