A pre-spice mass was a wild organic growth which arose deep under the surface of the desert on Arrakis. The culture was fungusoid in nature, and occurred when water mixed with the excretions of a little maker, a young sandworm.
The combination eventually created considerable pressure, which forced it to the surface of the planet as a spice blow. Its material was then transformed into spice melange by exposure to the sun and the air.
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