Polished Tiger Iron TI260 dolomite Vivianite is a rare iron

Vivianite is a rare iron phosphate and these nodules are found on the beach

120 mm x 90 mm x 50 mm thick at widest points

Dimensions at widest points approximately 130 mm x 85  x 25 mm thick

Dimensions at widest points approximately 105 mm x 90 mm x 70 mm deep

Weighs 821 grams

Polished Tiger Iron TI260 dolomite Vivianite is a rare ironTI260 Tiger Iron rough rock, cut and polished on one side with a natural rough back. Dimensions at widest points approximately 110 mm x 110 mm wide x 40 mm thick. Weighs: 678 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 magnetite, red jasper and chatoyant golden tiger