Rock Type: Dunite
Location: Nunavut, Canada
Description: The section is an intensely serpentinized (altered by the addition of water) olivine dunite. The process of serpentinization has resulted in release of Fe from the olivine that in turn attaches with the oxygen and little sulfur in the water to grow magnetite-pyrite-hematite (black) interstitial to the serpentinized olivine grains (grey-white). Sepentinized micas are also present throughout (wispy rectangles). The bright pink crystal is olivine not yet affected by serpentinization. The rock was studied for its diamond potential. A dunite is an ultramafic rock that forms from magma that was originally sourced from the deep mantle; where diamonds form.