Polished fossil Oncolite slab. ONC115 lace agate KO109 Killaloe Opal slab

KO109  Killaloe Opal slab

From near Yalgoo

Dimensions at widest points approximately 130 mm  x 100 mm x 8 mm thick

EPI90   Epidote

Weighs 694 grams

Polished fossil Oncolite slab. ONC115 lace agate KO109 Killaloe Opal slabONC115. 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. 170 mm x 70 mm x 7. 5 mm thick. Weighs 211 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