Polished Green Opal slab GRN100. Brecciated Mookaite Dimensions approximately 70mm x 100mm

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

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

SU156 Sunset Jasper slab

Dimensions at widest points approximately 150 mm x 110 mm x 11

From Field's Find in the Midwest region

Polished Green Opal slab GRN100. Brecciated Mookaite Dimensions approximately 70mm x 100mmGRN100 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..