Interesting

City of Black Tuff Stone

Capital city Yerevan is also known as “Pink City” because of the main stone used in construction, pink tuff. Just like that, Gyumri is called “City of black tuff” as the black tuff used to be the main consturcting material. Tuff (Italian: tufo)  is a rock type, consisting of volcanic ash extruded during volcanic eruption…

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