Famous Birthdays·June 23·Déodat Gratet de Dolomieu
Déodat Gratet de Dolomieu

FRDéodat Gratet de Dolomieu

A daring French geologist who gave his name to the Dolomite Alps, blending scientific exploration with a life of high adventure.

1750–1801 (age 51)·18th-century French geologist, namesake of Dolomite·Birthday: June 23

Photo: Déssiné d'apres le Portrait par M. Cordier, gravé par Ambroise Tardieu · Public domain

Biography

Déodat de Dolomieu lived with the intensity of a Romantic hero, his scientific pursuits forever intertwined with peril and politics. Born into the minor nobility, he was kicked out of the Maltese Order as a teenager for killing a man in a duel, a violent start that set the tone for a restless life. He turned his energy to the emerging science of geology, embarking on arduous journeys across the Alps, Italy, and Sicily. It was during these travels in the 1790s that he identified the unique carbonate rock that would later be named 'dolomite' in his honor by a colleague. Dolomieu was not a cloistered academic; he was a man of action caught in the tides of history. His scientific reputation won him a place on Napoleon's expedition to Egypt, but on the return voyage he was captured and imprisoned in Sicily for nearly two years under brutal conditions. His release was a cause célèbre among European scientists. He died young, his body worn out by hardship, but left an indelible mark on the map and on the understanding of the Earth's crust.

#1 When Déodat Was Born

The biggest hits of 1750

Déodat's Life & Times

The world at every milestone

1750Born
1755Started school
1763Became a teenager
1766Could drive
1768Could vote
1771Turned 21
1780Turned 30
1790Turned 40
1800Turned 50
1801Died at 51

Key Achievements

  • Identified and described the unique carbonate rock that was subsequently named 'dolomite' after him.
  • Was a prominent member of Napoleon's scientific corps during the French campaign in Egypt.
  • Published numerous influential geological memoirs and contributed significantly to early volcanic theory.
  • His extensive field work helped advance the understanding of mountain formation and rock classification.

Did You Know?

At age 18, he was sentenced to life imprisonment for killing a fellow knight in a duel, but his sentence was commuted due to his youth.

He was held as a prisoner of war in a Sicilian fortress for 21 months, where he continued his mineralogical studies.

The largest summit crater on the Piton de la Fournaise volcano on Réunion Island is named 'Dolomieu Crater'.

He was a correspondent of Benjamin Franklin, with whom he shared scientific ideas.

“I name these mountains for the bitter-tasting stone they contain.”

— Déodat Gratet de Dolomieu

Also Born on June 23

See all 100 famous birthdays →

Alan Turing

Alan Turing

1912

Frances McDormand

Frances McDormand

1957

Clarence Thomas

Clarence Thomas

1948

Bob Fosse

Bob Fosse

1927

Bryan Brown

Bryan Brown

1947

Caesarion

Caesarion

-47

David Lewis (Canadian politician)

David Lewis (Canadian politician)

1909

Alfred Kinsey

Alfred Kinsey

1894

Brooks Laich

Brooks Laich

1983

Colin Montgomerie

Colin Montgomerie

1963

Adam Faith

Adam Faith

1940

Anna Akhmatova

Anna Akhmatova

1889

AboutPrivacyTermsContact

© 2026 oresth.com