Secondary standard
NOTES: Homogeneous, but stay away from cracks and holes, and especially the sphalerite in the medium-sized grain in blue on the X-ray map.
 |  |
| Position | 10 |
| Mineral | Tetrahedrite |
| Sample Name | Tet |
| Type | Sulfide |
| Nominal formula | (Cu,Fe)12Sb4S13 |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Casapalea, Peru |
| Original reported analysis | Calculated from ideal formula |
| Composition quality | Secondary standard |
| Comments | EDS analysis and stoichiometry |
| S Fe Cu Zn As Ag Sb | 25.92 2.06 37.59 6.2 7.19 2.45 18.59 |
