Primary standard
NOTES: Homogeneous, but stay away from cracks and holes.
 |  |
| Position | 16 |
| Mineral | Albite |
| Sample Name | TAB |
| Type | Feldspar |
| Nominal formula | NaAlSi3O8 |
| Supplier | Holli Frey |
| Source | Tiburon peninsula, north of San Francisco, California |
| Original reported analysis | Electron probe standard at University of Michigan, Geology Department |
| Composition quality | Primary standard |
| Comments | Composition modified slightly based on stoichiometry, and standards-based EDS evidence for small amounts of K and Ca |
| O Na Al Si K Ca | 48.75 8.57 10.37 31.99 0.19 0.14 |
