Polished Chert Breccia slab CB112 dendritic opal 85 mm x 80 mm

85 mm x 80 mm x 30 mm thick

Highly translucent

Dimensions at widest points approximately 600 mm x 390 mm x 20 mm thick

An as yet unidentified stromatolite

170 mm x 100 mm x 9 mm

Polished Chert Breccia slab CB112 dendritic opal 85 mm x 80 mmCB112 Chert Breccia slab, cut and polished on one side . Dimensions at widest points approximately 130 mm x 110 mm x 27 mm thick. Weighs 683 grams. This breccia consists of innumerable angular fragments of assorted rock types but predominantly jasper, quartz and chert. It occurs in the Pinyalling Hills which are located in the midwest region of Western Australia, approximately 200 miles north of Perth.