Déodat Gratet de Dolomieu, French geologist and academic (d. 1801)
Dieudonné Sylvain Guy Tancrède de Gratet de Dolomieu usually known as Déodat de Dolomieu (French pronunciation: [deɔda də dɔlɔmjø]; 23 June 1750 – 28 November 1801) was a French geologist. The mineral and the rock dolomite and the largest summital crater on the Piton de la Fournaise volcano were named after him.