Secondary standard
NOTES: Homogeneous in the cobaltite areas (purple in the X-ray map). Stay away from the small grain of pyrite (green) and the yellowish areas, which is a different Fe-Co-As sulfide. No difference seen on the BSE image between the purple and yellow phases. It’s amazing that the two phases aren’t differentiated on the BSE image.
Position | 4 |
Mineral | Cobaltite |
Sample Name | Cob |
Type | Sulfide |
Nominal formula | CoAsS |
Supplier | Cannon Microprobe, Seattle, WA |
Source | Blackbird Mine, Joplin, Lemhi County, Idaho |
Original reported analysis | Semi-quantitative analysis |
Composition quality | Secondary standard |
Comments | Blackbird Mine material contains up to 2% iron. |
S Fe Co Ni As Sb | 19.33 1.75 32.2 1.49 45.02 0.23 |