Abstract Argillite by kiwinanna

Abstract Argillite

Rangitoto ki te Tonga (D’Urville Island) was a centre for making Argillite adzes (cutting tools) which have been found around the North and South islands. Argillite is a metamorphosed sandstone highly suitable for chipping. It is found on D'Urville island and in the neighbouring mainland ranges, but nowhere else in New Zealand. This is likely to have been used as a hammer to chipping off the cutting tools. My son found this on our beach a few years ago. It is one of my favourite rocks from my collection.
I'm so pleased you have a collection of rocks! Didn't know about this rock but it looks beautifully black and hard!
July 26th, 2015  
Beautiful rocks. Thanks for the information. I collect rocks too, and fossils
July 26th, 2015  
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