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Lyle: Can you describe your "granite" in detail with reference to comprising minerals, their element sizes and distribution/arrangement? You should be able to find systematic petrographic classifications on the web with pictures. Certain marketing profiles on commercial dimensional stone sites often provide valuable physical coefficients which may generally predict what actual tests on your specimens may later more precisely aver. Selecting something from Google Images which corresponds to roughly to your rock of--or directly to the named locality--might also be a winning approach to abet analysis. Another trove for historical context, though likely to prove a tough slog without indices, would be local newspaper archives. Regards, Edward Hennessey