Primary standard
NOTES: University of Michigan electron probe standard. Homogeneous, but stay away from the one Ca-rich grain (green in the X-ray map).
 |  |
| Position | 18 |
| Mineral | Augite |
| Sample Name | px69 |
| Type | Pyroxene |
| Nominal formula | Ca(Mg,Fe,Al,Ti)(Si,Al)2O6 |
| Supplier | Holli Frey |
| Source | Unknown |
| Original reported analysis | Electron probe standard at University of Michigan, Geology Department |
| Composition quality | Primary standard |
| Comments | Composition modified slightly based on stoichiometry |
| O Na Mg Al Si Ca Ti Cr Mn Fe | 43.93 0.7 9.6 2.86 23.85 15.2 0.32 0.42 0.08 3.05 |
