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Lemon Test - The lemon test is to determine the ability of your granite to resist etching. Follow the steps below: 1  Place a wedge of lemon or lime, cut side down, on the sample overnight. 2  Wipe the sample in the morning and hold it at an angle to the light.  Check for a rough spot where the lemon was placed.
A type N Schmidt Hammer IÂ·vas used to test the rock hardness in the field. Purity and solubility of limestone and dolostone samples Ivere tested using 3N hYdrochloric acid (HCI) under lahoraton' conditiollS. The result ofcompressive strength test indicates that limestone is the hardest(R=40Â­50). dolostone is second (R=25-.JO). conglomerate is third (R=25-37). and the remnants of mudstone are the softest (R=21.