Secondary standard
NOTES: Homogeneous, but stoichiometric constraints are limited and more work is needed..
 |  |
| Position | 45 |
| Mineral | Staurolite |
| Sample Name | Stau |
| Type | Fe-Mg silicate |
| Nominal formula | (Fe2+,Mg)2Al9(Si,Al)4O20(O,OH)4 |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Ticino, Switzerland |
| Original reported analysis | – |
| Composition quality | Secondary standard |
| Comments | Analysis shown based on EDS and loose stoichiometric constraints of this complex mineral. Requires careful work. |
| H O Mg Al Si Ti Mn Fe | 0.24 45.91 1.4 31.08 11.3 0.39 0.08 9.61 |
