Secondary standard
NOTES: Homogeneous, but stay away from cracks and numerous inclusions.
 |  |
| Position | 37 |
| Mineral | Oligoclase |
| Sample Name | Olig |
| Type | Feldspar |
| Nominal formula | (Na,Ca)(Al,Si)4O8 |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Mitchell Co., North Carolina |
| Original reported analysis | Calculated from ideal formula |
| Composition quality | Secondary standard |
| Comments | Analysis shown is based on EDS and stoichiometric constraints. |
| O Na Al Si K Ca | 47.98 6.17 12.75 28.84 0.34 3.92 |
