Polished Stichtite in Serpentine (Atlantisite) STI150 oldest agate in the world Dimensions at widest points approximately

Dimensions at widest points approximately 160 mm x 130 mm x 60 mm thick

Dimensions at widest points approximately 170 mm x 80 mm x 60 mm thick

90 mm x 40 mm  x 20 mm

175 mm high x 110 mm wide x 95 mm

The environment they grew in was possibly freshwater algal marshes

Polished Stichtite in Serpentine (Atlantisite) STI150 oldest agate in the world Dimensions at widest points approximatelySTI150. Stichtite in Serpentine rough rock, cut and polished on one side with natural back. Also known as Atlantisite. Dimensions at widest points approximately 120 mm x 95 mm x 90 mm thick Weighs 1,077 grams. From Stichtite Hill, Dundas near Zeehan,Tasmania.