Secondary standard
NOTES: Homogeneous, but stay away from cracks.
 |  |
| Position | 33 |
| Mineral | Benitoite |
| Sample Name | Benito |
| Type | Ba-Ti silicate |
| Nominal formula | BaTiSi3O9 |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Dallas Gem Mine, San Benito County, CA |
| Original reported analysis | Calculated from ideal formula |
| Composition quality | Primary standard |
| Comments | Very pure. Analysis shown here from EDS (trace Al) and stoichiometry. |
| O Al Si Ti Ba | 34.86 0.12 20.4 11.38 33.25 |
