Secondary standard
NOTES: Remarkably homogeneous. Stay away from the top two little grains, which are not acmite. I would also stay in the center region, avoiding the outer fractures and specks.
 |  |
| Position | 28 |
| Mineral | Acmite |
| Sample Name | Acmite |
| Type | Pyroxene |
| Nominal formula | NaFe3+(Si2O6) |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Willow Creek Basin, Okanogan County, Washington |
| Original reported analysis | Semi-quantitative analysis |
| Composition quality | Secondary standard |
| Comments | Analysis shown is based on EDS and stoichiometric constraints. |
| O Na Al Si Ca Ti Fe | 38.3 9.98 0.34 23.49 0.52 0.87 26.5 |
