Secondary standard
NOTES: Homogeneous, but stay away from cracks.
 |  |
| Position | 75 |
| Mineral | Scapolite |
| Sample Name | Scap |
| Type | Scapolite |
| Nominal formula | Na4Al3Si9O24(Cl) – Ca4Al6Si6O24(CO3) |
| Supplier | Cannon Microprobe, Seattle, WA |
| Source | Hancock Lake, King Co., WA |
| Original reported analysis | Calculated from ideal Na formula |
| Composition quality | Secondary standard |
| Comments | Analysis shown is based on EDS, and stoichiometric constraints based on optimizing NaCl vs. CaCO3 scapolite components of the analysis by least squares. Result, 62% of the NaCl component is probably not bad. Does it need more work? You bet. |
| C O Na Al Si Cl K Ca | 0.52 45.62 5.96 14.89 22.73 2.5 0.89 6.88 |
