Questionable
NOTES: Not homogeneous, considerable zoning in Na/K ratios that are evident on the BSE image. Lovely zoning, though.
 |  |
| Position | 38 |
| Mineral | Orthoclase |
| Sample Name | Or |
| Type | Feldspar |
| Nominal formula | KAlSi3O8 |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Crown Pant Mo Mine, Chelan Co., WA |
| Original reported analysis | Calculated from ideal formula |
| Composition quality | Questionable |
| Comments | Analysis shown is an average based on EDS and stoichiometric constraints. Ca-free. Zoning is in Na-K proportions, ±1.2% K. |
| O Na Al Si K | 46.17 0.58 9.73 30.39 13.12 |
