Rare localilty, this was from an isolated pocket in a road cut in Northeast Brazil. One of the be..
Transparent honey brown crystals scattered on matrix. Very rare occurence, from a road cut...
Tabular Barite crystal with smaller ones on matrix, unusual greenish brown color, discovere..
Crystal Opal with green patches and some orange and blue. Well cut and polished, Exce..
Brazilian white Opal from Piaui State is denser than Australian Opal, and is slightly harder.&nbs..