clearly the willemite occurs mostly as an exsolution network in something else. The second photo reveals that the “something else” is tephroite. Based on the exsolution pattern, it appears that there are at most two or three individual tephroite xls here. Note also that the pinkish area at lower right, while clearly not tephroite, appears to also be part of the exsolution network. See the fifth (last) photo for more on this area. The third photo shows the “back side” which is mostly calcite. But note the black and cream color “blob” at lower right. The black is pyrochroite. The rest is described in the fourth photo. The fourth photo is a close-up (FOV 7.0 x 4.6 mm) of the pyrochroite “blob” on the back. This blob is small (~ 1.3 cm) for the occurrence, but it illustrates some of the typical features of such blobs: black platy pyrochroite, criss-cross veinlets of a pinkish “slow fizz” carbonate (probably rhodochrosite), relict flecks of zincite, and a creamy, fizzy carbonate. The latter could be “Mineral F” (of Dunn), but it has not been analyzed. (However, the specimen is from an occurrence known to have Mineral F – aka UM1986-10-CO:ClHMgMnZn to the IMA.) Clearly this whole mess is a replacement, but it’s not clear of what. The fifth photo shows a close-up of another replacement typical of this assemblage. This is a small example of a different type of blob, namely a “layered blob”. In this case, the layers are mostly the pink carbonate already mentioned, with embedded fluoborite needles. The brown stuff at the bottom is tephroite. The pink layers are clearly separated by thin black layers (hetaerolite?) The precursor is again unknown – but the hetaerolite is suggestive. Bigger and better examples of both types of blobs were found. Here they are just little “bonuses”. This is and interesting but inadequately studied assemblage. The specimen is much more complex than a quick look might indicate. Note: The fluoborite in the pinkish blob was verified on other specimens. The UV photos is a time exposure. Both the calcite and willemite are very bright under SW UV, but what you perceive will depend on the intensity of the UV source and the quality of the UV filters. Weight 4.9 oz.