Primary standard
NOTES: Homogeneous, very pure.
 |  |
| Position | 31 |
| Mineral | Barite |
| Sample Name | Barite |
| Type | Sulfate |
| Nominal formula | BaSO4 |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Camas Creek, Lemhi County, Idaho |
| Original reported analysis | Calculated from ideal formula |
| Composition quality | Primary standard |
| Comments | Very pure. Analysis shown here from EDS (trace Sr) and stoichiometry. |
| O S Sr Ba | 27.43 13.75 0.09 58.73 |
