Natural stone materials used in construction are subdivided into the following three groups: Igneous – those include surface materials and materials, located deeper underground: these can be granite, basalt etc. Sediment – secondary rocks, formed under the influence of organisms such as limestone  or after destruction (weathering, precipitation) of igneous rocks Metamorphic – formed when […]

The city of Ivaylovgrad is a cultural and administrative center of Ivaylovgrad Municipality, situated on the middle reaches of Arda River in Eastern Rhodope Mountains, with a territory of 820 km2. This region is one of the most ecologically clean areas in the country as there are no large industrial sites, polluting the environment.    […]