The Piemonte mountains surrounding the city of Torino comprise a wide variety of rocks, characterized by a multitude of minerals, structures and colors. The Alps, for their long and complex history, offer a wide variety of ornamental stone used in the town, over the centuries, for both aesthetic and structural reasons. TourinStone is an application for the mobile phone that allows geotourists to walk in the center of Torino, where the visitor can be find Alpine rocks used in palaces and historical monuments as witness and tangible symbols of the city. The application consists of twenty-six historical sites of interest in each of which ornamental stones of historical and scientific interest can be observed in detail. The sites are grouped in four thematic itineraries through which the user can discover the city from the cultural and architectural point of view. By a numbered list of the stones used in all described monuments the user can access specific data on each rock including quarry location, petrographic description and utilization in Torino. The mobile application can be downloaded free from the App Store or Google Play respectively for Apple and Android devices.
Response to Reviewers:We have accepted the suggestions advanced by both referees. In particular we have valued the language corrections of Ref.#1 and we have checked the manuscript to correct mistakes
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