Definition of "forsterite" []

• A white variety of olivine that is mostly magnesium silicate Mg2SiO4. (noun)

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• "It was the crew of Apollo 15 who first found green olivine - specifically, a magnesium-rich variety that goes by the name forsterite, which is also the kind that was spotted by Spitzer."
• "The resulting magnesium silicate recrystallizes to form forsterite and silica in the temperature range 800-850° C, as an exothermic process."
• "The existence of forsterite in a star like HOPS-68 is not entirely without precedent; the crystals have been found in the vicinity of young stars before, but never so high up - and never behaving like rain before."