For my birthday I got an awesome mineral specimen case, as pictured below. What piqued my interest was the notations in the lid where the minerals are described with 5 specifications: C (obviously for Colour) then S, H/SG (I'm guessing specific gravity), L and CL.
Can anyone shed any light on what these abbreviations mean? Additionally, do the coloured squares mean anything or are they just for identification (they match colours painted on some of the samples).