| acid igneous rock |
| additive (material) |
| aluminum and aluminum alloys |
| and fluids |
| animal components |
| animal material |
| animal material by excretions |
| animal material by form or function |
| animal wax/tierisches Wachs/cera de origen animal |
| argillaceous rock |
| argillaceous sandstone |
| bark (plant material)/corteza |
| bark cloth/paño de corteza |
| basic igneous rock |
| beads by form |
| biological components |
| biological material |
| bituminous material |
| bixa |
| bixaceae |
| bone and bone components materials |
| bone by form as material |
| brocade |
| bulrush |