Polished Vivianite nodule half VV109 tube agate Porphyry is a general term
Description
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
weighs 490grams
CLA232 A slab
Weighs 130 grams
290 mm x 120-170mm x 18mm thick
Polished Vivianite nodule half VV109 tube agate Porphyry is a general termVV109 Vivianite nodule cut in half with face polished. Dimensions at widest points approx. 85 mm x 70 mm x 25 mm. Weight : 201 grams. From Demons Bluff, Anglesea, Victoria. Vivianite is a rare iron phosphate and these nodules are found on the beach, washed up from their source on the ocean floor.
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