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The Pierre de Jaumont (lit. "stone of Jaumont") is an oolitic limestone of the Upper Jurassic, found in Malancourt-la-Montagne, part of the commune of Montois-la-Montagne, in Lorraine, France.
Jaumont is the shorthand for "Jaune-Montagne" i.e. the "Yellow Mountain". The stone is lovingly called "sunny stone" by locals who enjoy the cheerful sight during gray winter weather.
175 millions year old sand/lime stone. The yellow color comes from iron rust.
References
Pierre de Jaumont Wikipedia(Text) CC BY-SA