I do not have the specific details of the Amarone Granite. However, as a general rule, granite is a highly durable and algae/mildew-resistant material that is suitable for outdoor use even in sunny and humid climates. However, the longevity of the stone installation depends on the type of stone, its finish, and the installation method. Therefore, it is recommended to consult a professional installer who has experience working with the specific type of granite to assess its suitability for the intended use.