Yes, Brazils Silver Nickel Slate can be used outdoors. It is a natural stone that is known for its durability and resistance to weathering, making it suitable for various exterior applications such as patio flooring, pool decks, walkways, and outdoor wall cladding. Its silver-gray color and unique veining can also add a touch of elegance to outdoor spaces. However, it is recommended to consult with a professional installer or stone supplier for specific recommendations and advice on maintenance for outdoor use.