Secondary standard
NOTES: Homogeneous, but stay away from cracks, holes, and specks that are bright in BSE images.
 |  |
| Position | 78 |
| Mineral | Siderite |
| Sample Name | Sid |
| Type | Carbonate |
| Nominal formula | FeCO3 |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Ivigtut, Greenland |
| Original reported analysis | Uncertain. This analysis MAY apply. Analysis of Ivigtut siderite from Sunius, 1925 in Deer, Howie and Zussman vol 5. |
| Composition quality | Secondary standard |
| Comments | Optimized EDS composition essentially identical to the DHZ composition, which was accepted after minor adjustment to better fit stoichiometry. |
| C O Mg Ca Mn Fe | 10.38 41.5 0.12 0.06 2.21 45.68 |
