Editing Pyroxenite (section)

==Distribution==
They frequently occur in the form of [[Dike (geology)|dike]]s or segregations in gabbro and peridotite: in [[Shetland]], Cortland on the [[Hudson River]], [[North Carolina]] (websterite), [[Baltimore]], [[New Zealand]], and in [[Saxony]]. They are also found in the [[Bushveld Igneous Complex]] in South Africa and The [[Great Dyke]] in Zimbabwe.<ref>Stratigraphy of the BIC http://jgs.lyellcollection.org/content/161/6/903/F2.large.jpg</ref>

[[Image:Peridotite Olivine-Orthopyroxene-Clinopyroxene - Common Peridotites highlighted.png|thumb|right|Classification diagram for peridotite and pyroxenite, based on proportions of olivine and pyroxene. The pale green area encompasses the most common compositions of peridotite in the upper part of the Earth's mantle]]
The pyroxenites are often subject [[serpentinite|serpentinization]] under low temperature retrograde metamorphism and [[weathering]]. The rocks are often completely replaced by [[Serpentine group|serpentine]]s, which sometimes preserve the original structures of the primary minerals, such as the lamination of hypersthene and the rectangular cleavage of augite. Under pressure-metamorphism hornblende is developed and various types of [[amphibolite]] and hornblende-[[schist]] are produced. Occasionally rocks rich in pyroxene are found as basic facies of [[nepheline syenite]]; a good example is provided by the [[melanite]] pyroxenites associated with the ''borolanite'' variety found in the Loch Borralan igneous complex of [[Scotland]].