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Geology, Palaeontology & Archaeology / Re: Resembling corroded pieces of metal, what are these stones?
« on: 15/05/2018 19:17:22 »
Use of acid is to test for the presence of carbonates (limestone is a carbonate rock). Ankerite, siderite and dolomite do not bubble much when acid is applied- at times you need to powder the rock first before it will bubble, or apply acid that has been heated.
Secondary iron oxides can be brittle and easily broken or crumbled, or can be quite dense- depending on how they formed.
Secondary iron oxides can be brittle and easily broken or crumbled, or can be quite dense- depending on how they formed.