Johann August Streng

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August Streng ( Albert Edelfelt , 1873)

Johann August Streng (born February 4, 1830 in Frankfurt am Main , † January 7, 1897 in Gießen ) was a German mineralogist, chemist and geologist.

family

Streng was the son of the Frankfurt businessman Johannes Streng and his wife Eva Rosine nee Reuhl. The family was related to Johann Wolfgang Goethe , whose great-grandmother was Anna Margarethe Streng and whose cousin Cornelia married the businessman Ulrich Thomas Streng in 1749. Streng, who was of the Protestant denomination, married Sophie, née Steuerwald (1830–1866), in their first marriage around 1853. Near the death of his first wife, he married Karoline Friederike Eleonore Elisabeth née Mettenheimer, daughter of the Giessen pharmacist Dr. Johan Friedrich Wilhelm Mettenheimer and his wife Louise nee Kempf.

life and work

He attended grammar school in Frankfurt am Main and studied chemistry from 1848 at the TH Karlsruhe and then with Robert Bunsen in Marburg. In 1852 he went to Heidelberg as Bunsen's assistant, where he completed his habilitation in 1853. In 1862 he became professor of chemistry at the Clausthal mining academy and, in 1867, professor of mineralogy in Gießen. From 1878 to 1879 he was rector of the University of Giessen. In 1895 he retired.

Strictly developed analytical chemical methods for mineral and rock analysis (microscopic chemical methods, dimensional analysis). Using microscopic methods, he examined crystalline rocks from the Harz Mountains, diorites from Kyffhauser, rocks from Minnesota, from the Nahe and porphyrites from Ilfeld .

The mineral Strengite is named in his honor.

In 1892 he became a member of the Leopoldina .

politics

From 1873 to 1875 he was representative of the Chancellor of the Giessen University Michael Franz Birnbaum, a member of the First Chamber of the Estates of the Grand Duchy of Hesse . From 1889 to 1895 he was again a member of the First Chamber (the position of Chancellor was vacant during this time). He took his deputy oath on December 16, 1873.

literature

  • Klaus-Dieter Rack, Bernd Vielsmeier: Hessian MPs 1820–1933. Biographical evidence for the first and second chambers of the state estates of the Grand Duchy of Hesse 1820–1918 and the state parliament of the People's State of Hesse 1919–1933 (= Political and parliamentary history of the State of Hesse. Vol. 19 = Work of the Hessian Historical Commission. NF Vol. 29) . Hessian Historical Commission, Darmstadt 2008, ISBN 978-3-88443-052-1 , pp. 880-890.

Web link

Individual evidence

  1. ↑ Meyers Konversationslexikon
  2. ↑ Member entry by August Streng at the German Academy of Natural Scientists Leopoldina , accessed on February 25, 2016.
personal data
SURNAME Strictly, Johann August
BRIEF DESCRIPTION German geologist and mineralogist
DATE OF BIRTH February 4, 1830
PLACE OF BIRTH Frankfurt am Main
DATE OF DEATH January 7, 1897
Place of death to water