Primary standard
NOTES: Very strong stoichiometric constraints. Homogeneous, but stay away from numerous cracks (right side) and high BSE brightness inclusions.
 |  |
| Position | 27 |
| Mineral | Albite 1 |
| Sample Name | Alb 1 |
| Type | Feldspar |
| Nominal formula | NaAlSi3O8 |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Great Exelsior Mine, Whatcom Co., WA |
| Original reported analysis | Calculated from ideal formula |
| Composition quality | Secondary standard |
| Comments | Albite, not orthoclase. Very pure. Composition given here is based on EDS analysis and stoichiometry, and is probably very good. |
| O Na Al Si K | 48.8 8.72 10.29 32.12 0.08 |
