Ahlat Stone

Ahlat stone is a type of stone extracted from the foothills of Mount Süphan and Mount Nemrut in the Ahlat district of Bitlis Province. It originates from volcanic rocks such as ignimbrite, pumice, and tuff. It has been used in numerous historical structures and continues to be employed in many contemporary buildings. It commonly appears in red, brown, gray, and beige hues, with different uses depending on its color.

Selçuklu Mezarlığı (Anadolu Agency)

Properties

This stone, formed by the combination of volcanic rocks such as tuff, ignimbrite, and pumice, is soft when first extracted and easy to work with; however, it hardens over time upon exposure to air, becoming durable. Thanks to its light and sponge-like structure, it provides sound and thermal insulation, making it a preferred material for both interior and exterior building facades. It is available in a variety of colors including red, brown, gray, and beige tones. Due to its aesthetic richness and ease of shaping, it has been widely used in decorative stonework and historical architecture. Additionally, its porous texture allows the stone to breathe, contributing to moisture control.

Formation

When volcanic mountains such as Nemrut and Süphan erupt, the ejected lava flows cool upon contact with the atmosphere and transform into tuff, a very light type of volcanic rock. Tuff is a lightly porous stone variety. It begins to consolidate when mixed with pumice (sponge stone), volcanic fragments, and ignimbrite. This consolidation gradually hardens and compacts over millions of years due to geological processes and subsurface pressure, yet retains its workability. As a result, it becomes suitable for use in various buildings and structures.

Varieties and Applications

Red Ahlat Stone

This variety, distinguished by its reddish tones, derives its color from the chemical composition and oxidation processes of minerals such as iron oxide within it. Due to its porous and lightweight structure, it is an excellent material for thermal and acoustic insulation, and its ease of shaping further enhances its appeal. These properties make it suitable for both architectural decoration and exterior cladding. Red Ahlat stone, frequently found in historical structures from the Seljuk and Ottoman periods, is one of the traditional building elements noted for its distinctive aesthetic impact.

Example of the Stone’s Use in Historical Structures: Selçuklu Mezarlığı (Anadolu Agency)

Brown Ahlat Stone

Brown Ahlat stone acquires its color from the minerals and chemical components it contains, ranging from dark chestnut to beige tones. It is commonly used in landscape design, fountains, garden decorations, and garden walls. It has been employed in numerous historical monuments such as the Selçuklu Mezarlığı and Emir Bayındır Kümbeti. When first extracted from the quarry, the stone has a softer structure, but it hardens and becomes more durable after being worked and over time.

Example of the Stone’s Use in Landscape Design (Anadolu Agency)

Gray Ahlat Stone

Gray Ahlat stone derives its color from its pumice content and mineral composition. Its lightweight, porous, and moisture-permeable structure offers particular advantages for acoustic and thermal insulation. Its gray tones darken when wet and lighten when dry, providing an aesthetic appearance suitable for both interior and exterior cladding. Its ease of shaping has made it a preferred material in stonework and decorative details, and it has also found application in modern architectural practices.

Example of the Stone’s Use in Stonework Art ((Anadolu Agency)