8 rocks were measured by the APXS, and one (Half Dome) was measured in two places, for a total of 9 APXS rock measurements. The 8 rocks measured are:
| Barnacle Bill |
| Yogi |
| Wedge |
| Shark |
| Half Dome (in two places) |
| Moe |
| Stimpy |
| Chimp |
So far, the only measurements that have been converted to chemical composition are the ones obtained before the rover battery died, when the APXS X-ray spectra had good signal-to-noise ratio:
| Barnacle Bill |
| Yogi |
| Wedge |
| Shark |
| Half Dome (first location) |
These are reported in Rieder et al., 1997, Science vol. 278, pp. 1771-1774:
http://www.sciencemag.org/cgi/content/full/278/5344/1771
In addition, we are unsure whether "Scooby Doo" is a hard soil or rock. An APXS measurement was taken of Scooby Doo, and the chemistry is similar to that of the other soils. If Scooby Doo is a soil, then 7 Mars soil measurements were made by the APXS.