Polished fossil Oncolite slab. ONC114 Marramamba Tiger Eye BM312 Brecciated Mookaite rock

BM312  Brecciated  Mookaite rock

Weighs 626 grams

Dimensions at widest points approximately 250 mm  x 120 mm x 9

Dimensions approximately 100 mm x 90 mm x 80 mm thick

130 mm x 80 mm x 10

Polished fossil Oncolite slab. ONC114 Marramamba Tiger Eye BM312 Brecciated Mookaite rockONC114. Fossil Oncolite polished slab. From the Miocene "Trealla Limestone" north of Carnarvon, Western Australia . Age is approx. 15 million years. Dimensions at widest points approx. 150 mm x 100 mm x 7. 5 mm thick. Weighs 241 grams. Oncolite is a limestone composed largely of oncoidsrounded, coated grains that grow as thin layers of lime mud accumulate around a tiny nucleus (such as a sand grain or shell fragment) under microbial influence. Formed