Polished Tiger Iron TI315 Citron chrysoprase The green colouration is caused

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

Dimensions at widest points approximately 170 mm x  120 mm x 20 mm thick

Dimensions at widest points approximately 80 mm x 60 mm x 11 mm thick

CH421  Chrysoprase  slab polished  on one side

Polished Tiger Iron TI315 Citron chrysoprase The green colouration is causedTI315 Tiger Iron , Tiger Iron rough rock, cut and polished on one side with a natural rough back. Sits nicely as a display specimen ! Dimensions at widest points approximately 210 mm x 150 mm x 90 mm thick. Weighs: 4,362 grams From the Cleaverville Formation, Ord Ranges near Port Hedland, Western Australia. Age is over 3 billion years. Tiger iron is a banded iron formation (BIF) or jaspilite that has alternating layers of black and brown hematite