Prophecy Stones are very fascinating stones. They are a pseudomorph of Limonite, Hematite After Marcasite, and Pyrite. The original crystal structure remains from the Marcasite Pyrite but has morphed into Limonite and Hematite.
These are from a remote area of the White Desert in Egypt and are not seen very often. They are very high vibration, 3rd eye, and useful in meditation and astral, and visionary work.
A Prophecy Stone is a calming stone for the mind and a stone for success in legal disputes. It is a memory enhancer and an aid to clarity of thought and control of stress.