Yes, Indias Altamira Gneiss can be used outdoors. Gneiss is a type of metamorphic rock that is known for its strength and durability, making it suitable for various outdoor applications. It is commonly used in construction and landscaping projects for outdoor flooring, walls, steps, and even sculptures. However, it is advisable to consult with a professional or supplier to determine the specific suitability of Altamira Gneiss for your intended outdoor use, as different types of gneiss may have varying characteristics and durability.