Geologic Occurrence
Found in the earth’s mantle, the perovskite’s occurrence at Khibina Massif is restricted to the under saturated ultramafic rocks and foidolites, due to the instability in a paragenesis with feldspar. The complexity is made by an extended series of rocks from early alkaline ultramafic members to late carbonatites that comprise alkaline and mafic igneous rocks such as nepheline syenite, melilitite, kimberlite and rare carbonatites in ultramafites. Perovskite occurs as small anhedral to subhedral crystals filling interstices between the rock-forming silicates.
Read more about this topic: Perovskite
Famous quotes containing the word occurrence:
“One is absolutely sickened, not by the crimes that the wicked have committed, but by the punishments that the good have inflicted; and a community is infinitely more brutalised by the habitual employment of punishment than it is by the occasional occurrence of crime.”
—Oscar Wilde (1854–1900)