Polished Magnesite specimen. MAP188 black conglomerate (Porphyritic basalt)

(Porphyritic basalt)

Weighs 675 grams

near Port Hedland

Dimensions at widest points approximately 90 mm  x 40 mm wide x 7 mm thick

Dimensions at widest points approximately 105 mm x 60 mm x 40 mm thick

Polished Magnesite specimen. MAP188 black conglomerate (Porphyritic basalt)MAP188. Magnesite (Lemon chrysoprase) rough rock, cut and polished on one side with a natural back. Dimensions at widest points approximately 120 mm x 50 mm x 60 mm thick. Weighs 840 grams. Thick enough to cut more slices or leave intact as a display specimen ! The subtle lime green colouration is caused by the presence of nickel mineralisation. From north of Kalgoorlie , Western Australia.