Yes, Brazils Misty Rain Quartzite can be used for exterior applications in very humid climates. Quartzite is a natural stone that is highly durable and resistant to heat, moisture, and weathering. It is suitable for use in various outdoor projects, including countertops, wall claddings, paving, and pool surrounds. However, proper installation and maintenance are essential to ensure the longevity and performance of the stone in humid climates.