  Let $P$ be a Borel probability measure on $\mathbb R^2$ supported by the
Cantor dusts generated by a set of $4^u,\ u\geq 1$, contractive similarity
mappings satisfying the strong separation condition. For this probability
measure, we determine the optimal sets of $n$-means and the $n$th quantization
errors for all $n\geq 2$. In addition, it is shown that though the quantization
dimension of the measure $P$ is known, the quantization coefficient for $P$
does not exist.
