How do you make your own lava? | #Geology #GeologyPage #Lava A recipe for lava 1- Rock The main ingredient — the only one, really — is volcanic rock called basalt. UB geologists shipped two tons of it in from a Texas quarry. 2- Furnace The rock is dumped into a magnetic induction furnace that heats the mixture to about 2,500 degrees Fahrenheit. The contents are stirred every half hour. 3- Lava After about three to four hours, the lava is ready. Each lava-water experiment will use a roughly 10-ga