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RM2670   Opal with dendrites

Monto Outcrop, North Burnett Region, Queensland, Australia

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.

Size: 6.2 x 4.5 x 3.3 cm.
Found in ± 1977.

Col. Joan Astor (Barcelona).