Polished Green Opal slab GRN100. Brecciated Mookaite From Field's Find in the

From Field's Find in the Midwest region

Dimensions at widest points are approximately 85 mm x 70 mm x 50 mm

TI274   Tiger Iron slab

This museum quality specimen has been cut at right angles to the bedding and displays the columnar structure beautifully

Dimensions approximately 70mm x 100mm x 10-30mm thick

Polished Green Opal slab GRN100. Brecciated Mookaite From Field's Find in theGRN100 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 160 mm x 75 mm x 11 mm thick Weighs 283 grams. Green Opal occurs at a location south of Kalgoorlie in the Eastern Goldfields of Western Australia. The green colouration is caused by traces of nickel and or chromium. Sometimes it exhibits striking contrasting veins of magnesite..