Polished fossil stromatolite. Eucapsiphora leakensis. EUC136 Irregully formation Pollucite slab

Pollucite slab

Porphyry is a general term that is used rather loosely for  igneous rocks which contain relatively large isolated crystals set in a fine-grained groundmass

Large reserves of this stone occur in Western Australia

Weighs 130 grams

Polished fossil stromatolite. Eucapsiphora leakensis. EUC136 Irregully formation Pollucite slabEUC136 Very rare fossil stromatolite slab polished on one side. Eucapsiphora leakensis. These small branching columnar stromatolites are from the Mount Leake Sandstone, Earaheedy Group, Western Australia. Location is near the town of Meekatharra. Age is Palaeoproterozoic (1. 6 to 2. 5 billion years). The environment they grew in was most probably a sandy tidal flat or braided river channel. Approx. 105 mm x 75 mm x 7 mm thick. 85 grams.