摘要： The use of Cathodoluminescence (CL) as an analytical tool for geoscience and materials research is well established. Many minerals exhibit CL when activated by the high-energy electron beam bombardment of the Scanning Electron Microscope (SEM) [1]. CL imaging capabilities vary among laboratories due to the differences in detector type, sample preparation (epoxy, polish, coating), SEM type (W, LaB6, FE) and analytical conditions (kV, pA/nA, sample temperature). An interlaboratory comparison was initiated to assess the optimal conditions for obtaining high resolution CL imagery [2]. Quartz (and its polymorphs) are often difficult to image by CL due to low CL response and thus it was chosen as a test material. Composed of fine to medium-grained silicon dioxide, St. Peter Sandstone is used extensively as a proppant in hydraulic formation fracture (fracking) [3]. Appropriate sample preparation is necessary for optimal CL imaging results, varying from lab to lab. In the case of the porous St. Peter Sandstone with incomplete and fragile intergranular cement structures, producing a polished sample surface without plucking grains and removing the cements is imperative. For this interlaboratory comparison, polished samples were prepared from a single St. Peter Sandstone sample that was cored perpendicular to the bedding. Samples were imbedded in Epoxy and polished to a sub micron finish. Six of these samples were shared with other SEM-EPMA laboratories with the goal of refining SEM-CL conventions for cement study and imagery. As of abstract deadline time, we have 3 examples of CL images to present, and expect to have others by the M&M conference.