White "Lava" Stone: Natural lava (basalt) is only available in shades of black and brown. All white and other colors that are commercially sold as lava are a similar stone (likely pumice, which is also volcanic). Due to the porous nature, these beads are a great carrier for essential oil aromatherapy jewelry.
2018 Update: We're now even less sure what white "lava" stone beads are ... but we are sure you should not heat them in a kiln or with a torch, as some batches actually BURN (with a chemical smell and powdery residue).
Please see the Related Products links below for similar items, and more information about this stone.