compositions consistent with opal; we interpret these crystals as opal replacements after esquireite...with or embedded in white, massive witherite and/or opal. Witherite, in particular, seems to be almost always...contemporaneously with one another, although the opal replacements noted above obviously postdate esquireite...esquireite. Besides sanbornite, witherite, and opal, at the Esquire #1 claim esquireite is also associated...R., CAMALLI, M., CARROZZINI, B., CASCARANO, G.L., DE CARO, L., GIACOVAZZO, C., POLIDORI, G., & SPAGNA |
Água de Pau Volcano, São Miguel, Azores, Portugal