There seems to be quite a compendium of tests and information on standards and identification of local limestone in Chapter 11 of Building with Lime by Holmes and Wingate. EYP/ Christopher J. Tavener, AIA, LEED AP Technical Director, Principal Einhorn Yaffee Prescott Architecture & Engineering, P.C. Office: 518.431.3411 Fax: 518.431.3333 Cell: 518 281.5707 eypae.com -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: <http://listserv.icors.org/archives/bullamanka-pinheads.html>