Polished Golden Amphibolite slab GA144 oldest agate in the world Dimensions at widest points approximately

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

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

DOT104  Tumble polished Dendritic Opal

Highly translucent purple with dendrites

Polished Golden Amphibolite slab GA144 oldest agate in the world Dimensions at widest points approximatelyGA144 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.