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It's not related to lunar materials blasted to Earth via lunar impacts. It's a late stage crystallisation accessory mineral in igneous intrusions. It forms as the last stages of crystallisation in intrusive dykes and sills. Also, during that crystallisation it's also undergoing secondary alteration to other phases in between the crystals of plagioclase and pyroxene. It occurs in close association baddeleyite and zirconolite within quartz/Kspar intergrowths between the plag and pyroxene laths.
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