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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.
The letter-based Chappell & White classification system was proposed initially to divide granites into I-type granite (or igneous protolith) granite and S-type or sedimentary protolith granite. Both of these types of granite are formed by the melting of high grade metamorphic rocks, either other granite or intrusive mafic rocks, or buried sediment, respectively. M-type or mantle derived granite was later proposed to cover those granites that were clearly sourced from crystallized mafic magmas, generally sourced from the mantle.