Yes, Frances Pont-Aven Gneiss can be used outdoors. Gneiss is a metamorphic rock known for its durability and resistance, making it suitable for various outdoor applications. It can be used as paving stones, for building facades, as decorative elements in gardens and landscapes, and in other outdoor construction projects. However, specific uses and considerations should be discussed with professionals or experts in the field to ensure its suitability and proper application.