Aesthetic specimen of opal with notable bluish iridescences in a very fine-grained sandstone matrix. From Quilpie area, a locality with an economy based on the grazing and mining industries. The area has one of the largest deposits of boulder opal in the world. A gem...

Very bright opal from this Australian locality, with orange colors, the elongated dendrites of pyrolusite give it an aesthetic touch. This locality is formed by basaltic rocks over an area of more than 1000 km², most of them north and south of the Dawes mountain range. The main period of volcanic activity was at c. 25Ma. Acquired by Joan Astor from the well-known Jaume Serrate (Terrassa), whom we could describe as a "craftsman" of minerals.

A classic banded opal from Australia, with violet, green, blue colors. With a good exposed surface showing opalescence. It comes from the A. Trigo collection.