This is one of only a very FEW specimens, perhaps under half a dozen, that came out on quartz matrix. These crystals reach 3 cm and have a natural, wet luster to them - the best lustrous pieces of the lot were, seemingly, the ones on the quartz. Hence the higher price for the few that are so good. The matrix is actually a shard of quartz, crystallized on the display face though not elsewhere on the matrix.