Calcarenite can be used indoors as a decorative material for walls, floors, countertops, and other surfaces. However, it is important to note that calcarenite is a softer and more porous material than other natural stones such as marble, granite, and quartz, so it requires more care and maintenance to prevent staining, chipping, and wear. Additionally, calcarenite may not be suitable for high-traffic areas or areas that are exposed to moisture or heat, as it is more prone to damage and discoloration. To ensure that calcarenite is a suitable material for your indoor project, it is recommended to consult with a professional stone supplier or installer.