Secondary standard
NOTES: Homogeneous, but stay away from cracks and the Fe-rich patch on lower-right side of the small grain.
 |  |
| Position | 1 |
| Mineral | Arsenopyrite |
| Sample Name | AP |
| Type | Sulfide |
| Nominal formula | FeAsS |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Gifford Ridge, North Bend, King County, WA |
| Original reported analysis | Semi-quantitative analysis |
| Composition quality | Secondary standard |
| Comments | The arsenopyrite from this source has been assayed as containing <0.01 ppm Au |
| S Fe As Sb | 19.67 34.25 45.73 0.35 |
