Aug 18, 2016 · A number of different kinds can be bought, from the simple reading glass to the precisely made hand lens. A lens with ten-power magnification is good for general use. 4. A small magnet to test whether or not a mineral is magnetic. 5. Dilute (10%) hydrochloric acid (HCl), also known as muriatic acid, to test carbonate rocks and minerals. You can ...
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