| IGSN | Sample Type | Notes | Location | Number Thin Sections | Storage Location |
|---|---|---|---|---|---|
| GRD02ZVS0 | Gibbsite | Gibbsite aka Hydrargyllite | Brazil | 0 | Ritter 154, 12 B |
| GRD0396S0 | Gibbsite | Original Label : Aluminum hydroxide; plus other aluminum oxides, as well as those of iron. Occurs as a residual weathering product. Also Mining Co. | Oregon | 0 | Ritter 154, 12 B |
| GRD039KS0 | Gibbsite | Botryoidal Gibbsite | Brazil | 0 | Ritter 154, 12 B |
| GRD039LS0 | Gibbsite | Brazil | 0 | Ritter 154, 12 B |