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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
It weighs 920 grams
Dimensions at widest points approximately 65 mm x 60 mm x 25 mm thick
Weighs 203 grams
Polished Tiger Eye slab TE462 polished crazy lace Porphyry is a general termTE462 Marra Mamba Tiger Eye slab polished on one side . Dimensions at widest points approximately 80 mm x 60 mm x 10. 5 mm thick. It weighs 156 grams. From the "Marra Mamba Iron Formation" near Mt. Brockman in the Pilbara region of Western Australia.
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