Yes, Mexicos Green Grey Porphyry can be used outdoors. Porphyry is a durable and versatile natural stone that is commonly used in outdoor applications such as paving, walkways, driveways, patios, and pool decks. Its dense composition and resistance to weathering make it suitable for withstanding the elements and heavy foot traffic. Additionally, its natural beauty, various colors, and textures make it a popular choice for outdoor landscaping projects.