Karst Coffee Mugs
Karst is a topography formed by the dissolution of soluble minerals, such as limestone, dolomite, and gypsum, resulting in a completely flat topography. Sinkholes and caves are characteristic features of underground drainage systems in the area. As well as more weather-resistant rocks like quartzite, where temperature and pressure match perfectly, this has also been documented. One of these karst coffee mugs would make a great gift for someone who loves caves.