Black Jasper Conglomerate slab B221 Chrome chalcedony Dimensions at widest points approximately

Dimensions at widest points approximately 100 mm x 80 mm x 70 mm thick

from the Proterozoic "Duck Creek Dolomite"

Dimensions at widest points approximately 120 mm x 85 mm x 40 mm thick

190 mm x 95 mm x 25 mm thick

Weighs 343 grams

Black Jasper Conglomerate slab B221 Chrome chalcedony Dimensions at widest points approximatelyB221 Black Jasper Conglomerate slab, polished on one side. From near Nullagine, Western Australia. Dimensions at widest points approximately 120 mm x 45 mm x 10. 5 mm thick Weighs 106 grams Conglomerate is a sedimentary rock consisting of individual pebbles within a finer grained matrix that have become cemented together. Conglomerates are a very common rock type that occur in numerous locations world wide. However this one is special due to it's