How do you make Spice, or "Melange"? (It's not Sandworm Poop)
Spice can only be made on the planet of Arrakis, or "Dune" because the sandworms *are* the only source of it & they only exist on Arrakis.
Step 1
There is a substance called the "pre-spice mass".
Pre spice is the stage of "fungusoid wild growth" from a mixture of water & the excrement, or poop, of the "half plant-half-animal" vectors of the sandworm, called "little makers".
Biological vectors are usually arthropods (mosquitoes, ticks, flies, fleas & lice) that usually transmit infectious diseases either actively or passively.
"fungusoid" isn't a real scientific term, so I'm assuming it means "fungus" in this future world. Could also be like land-algae, bc of "half plant-half-animal" & "mass" words
So again:
Water
+
poop, or "excrement", of these tiny creatures
=
pre-spice mass
Step 2
Dune reads, “a gigantic bubble of carbon dioxide" then forms deep in the sand, traveling or "heaving" upwards into a "blow".
As it grows, what's in the deep sand travels up, what's on the surface travels down. This is an exchange of material.
This blow has a "whirlpool" in its center. They are very explosive & will kill most nearby living things when they do explode.
Step 3
Whatever is left at the top (the pre-spice mass), when exposed to the sun & air, then finally becomes the spice people harvest.