| primary (alpha) | the amino acids which comprise a protein |
| secondary (beta) | the arrangement of a protein's amino acid strings into planar or 2-dimensional form |
| tertiary (gamma) | the 3-dimensional way in which the protein folds about itself |
| elemental | e.g. zinc, copper, tin, lead |
| mineral | i'm not a mineralogist, but these are the microscopic crystals crystals which are clumped together as sheets and clusters in rocks (they are macroscopic in gem crystals, like amethyst or citrine) |
| lithosal | the rocky veins and structures which comprise the bodily organs, joints, limbs, and such of a kran |