Polished Marillana Conglomerate MC117 stromatolite GRN110 Green Opal rough rock

GRN110  Green Opal rough rock

Chinese Writing Stone is a porphyritic basalt (porphyry) with groups and rosettes of plagioclase feldspar

Small quartz crystals visible in cavity

Dimensions at widest points approximately 100 mm x 75 mm x 27 mm thick

GREEN83  Green Opal & Magnesite rough rock

Polished Marillana Conglomerate MC117 stromatolite GRN110 Green Opal rough rockMC117 Marillana Conglomerate rough rock, cut and polished on one side with a natural back. Dimensions at widest points approx. 130 mm x 110 mm x 30 mm thick. Weight is 605 grams. From Marillana station in the Pilbara region of Western Australia. Conglomerate is a sedimentary rock consisting of individual pebbles (clasts) within a finer grained matrix that have become cemented together. Conglomerates are a very common rock type that occur in numerous