Indias Ocean Black Phyllite is a type of natural stone that is commonly used for interior applications such as flooring, countertops, and wall cladding. However, using it for exterior applications in very rainy climates may not be the best idea.

Phyllite is a metamorphic rock that is known for its weather-resistant properties, making it suitable for some outdoor applications. However, it is important to consider the specific conditions of the location where it will be installed. If the climate is characterized by heavy rains and high levels of moisture, there are a few factors that need to be taken into account:

1. Porosity: Phyllite, like many other natural stones, has varying levels of porosity. High porosity means that the stone will absorb more water, which can lead to water damage, staining, and the growth of mold or mildew. In very rainy climates, its important to choose a stone with low porosity to minimize the risk of water-related problems.

2. Freeze-Thaw resistance: In areas with cold temperatures and rain, the freeze-thaw cycle can be a concern. When water seeps into porous stone and freezes, it expands, which can lead to cracking or spalling. To withstand such conditions, its essential to choose a stone with good freeze-thaw resistance.

3. Slip resistance: Rainy climates often mean wet surfaces, and its crucial to ensure that the chosen stone offers adequate slip resistance to prevent accidents.

Given these considerations, it is advisable to consult with a local stone supplier or a professional with expertise in the specific climate and characteristics of the site. They will be able to provide guidance on whether Indias Ocean Black Phyllite is suitable for use in exterior applications in very rainy climates or suggest alternative materials that may be more suitable.