Allophane, Imogolite are . . . . . . . . in origin.

Solution (By Examveda Team)

Allophane, Imogolite are Volcanic in origin. Volcanic soils are formed by weathering of Volcanogenic materials.
Allophane is an important colloidal component of soils derived from recently deposited volcanic materials. Imogolite is an aluminium silicate clay mineral formed from volcanic ash.