A Geological Material is a material extracted as-is from the earth in rock or sediment form, including rocks, clays, sands, limestone, and other industrial minerals.

Geological Materials are a Special Condition because they have variable or unknown composition and a lack of CAS numbers. The potential for impurities is related to specific sources or regions, and it is difficult to monitor the variability of these materials.

The Special Conditions guidance identifies how to notate Biological Materials on an HPD using the term “SC:GeoMat,” or a CAS number, if available. It instructs manufacturers on how to provide information on the origin of material, typical composition, potential presence of toxic metals, and available information on radioactive elements (for rock or stone-based materials).

This is just a summary; detailed information is available in HPDC’s Emerging Best Practices guidance.