Secondary standard
NOTES: Homogeneous, but stay away from cracks and little specks that are bright in BSE images.
 |  |
| Position | 35 |
| Mineral | Ankerite |
| Sample Name | Ank |
| Type | Carbonate |
| Nominal formula | CaFe(CO3)2 |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Spruce Claim., North Bend, King Colk WA |
| Original reported analysis | Calculated from ideal formula |
| Composition quality | Secondary standard |
| Comments | Mg-rich ankerite, actually Fe-rich dolomite. Composition reported here is based on EDS and stoichiometry. |
| C O Mg Ca Mn Fe | 12.05 48.16 6.42 20.11 0.51 12.75 |
