A curated collection of four black boulder opal rocks. Rock 1: Large paint-like black tone opal with green patterns. Rock 2: Triangular rock chunk with black opal seams. Rock 3: Practice rock with purple, green and white deposit. Rock 4: Practice rock with slate blue-grey opal formation. Great combo of cutting stones and practicing lapidary work. Ironstone host rock mined at famous Winton opal fields. Mine Area: Central West Queensland, Australia. Total weight approximately 367 grams. Approximate dimensions of these rough opal rocks are: (1) 7 x 3 x 4 (2) 9 x 4 x 3 (3) 5 x 4 x 2 (4) 7 x 3 x 3 cm Some photos in outdoor daylight, as-mined dry condition. Some photos wet to simulate polishing potential of the opal.
