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70 million years (Cretaceous)
Chalcedony grading into silicated magnesite
CC121 Chrome chalcedony slab
Approximate dimensions at widest points 200 mm x 100 mm x 60 mm thick
85 mm x 80 mm x 45 mm thick
Polished Tiger Iron slab TI268 crystophase 70 million years (Cretaceous)TI268 Tiger Iron slab, cut and polished on one side. Dimensions at widest points approximately 130 mm x 70 mm wide x 7 mm thick. Weighs: 135 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 eye.
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