As temperature decreases further, the early crystallized Fo-rich olivine will react with the molten mixture. Olivine do not co-exist with quartz. Widely distributed in metamorphic rocks. There are two solid solution series. Hi T. Hi P. High temperature metamorphic rock, both contact and regional.
Mineral has directional hardness.
Classification based on crystallography. Color, unit cell size and refractive index increases as Fe content increases. Jadeite Further classification based on chemical composition, x-ray, microscope.