Yes, Indias Devli Green Quartzite can be used for exterior applications in very rainy climates. Quartzite is a metamorphic rock that is highly resistant to water absorption and weathering. It has good durability and can withstand the effects of constant rainfall, making it a suitable choice for outdoor applications such as paving, cladding, and roofing. However, it is always recommended to properly seal and maintain the stone to ensure its longevity and to prevent water infiltration.