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Flower agate is a type of dendritic (from Greek, meaning tree-like) agate. There are hints to how the patterns formed. The agate began as agates usually do: hot, mineral-rich water in a hole in another rock. As the water cooled, manganese oxide (black) and/or iron oxide (red) coalesced into nodules or inclusions. Soon after, micro-crystalline quartz and moganite are produced from the silica-rich water, which coalesce around the manganese and iron oxide inclusions.
For more about agate, read What is Agate?