Polished Golden Amphibolite slab GA144 oldest agate in the world At widest points approx

At widest points approx

Dimensions at widest points approximately 220 mm x 115 mm x 10 mm thick

Dimensions at widest points approximately 130 mm high x 70 mm x 55 mm thick

The green colouration is caused by traces of nickel and/or chromium

Highly translucent purple with dendrites

Polished Golden Amphibolite slab GA144 oldest agate in the world At widest points approxGA144 A slab, polished on one side. Dimensions at widest points approximately 170 mm x 125 mm x 15 mm thick. Weighs 582 grams. The amphibolite, most likely grunerite , has now been largely altered to hematite, goethite and quartz and it displays a beautiful golden iridescence. Also called "Gold Leaf Stone". It occurs in the Pilbara region of Western Australia on Abydos Station approximately 120 km south of Port Hedland.