- Georg Brandt
Infobox Scientist
name = Georg Brandt
birth_date = birth date|1694|07|21
birth_place =Skinnskatteberg
death_date = death date and age|1768|04|29|1694|07|21
death_place =Stockholm
residence =
citizenship =
nationality = Swedish
ethnicity =
field =chemistry mineralogy
work_institutions =Uppsala University
alma_mater =
doctoral_advisor =
doctoral_students =
known_for =cobalt
footnotes =Georg Brandt (
July 21 1694 [Some sources have 26 June.] –April 29 1768 ), was a Swedish chemist and mineralogist who discoveredcobalt (c.1735). He was the first person to discover a metal unknown in ancient times. [ [http://www.britannica.com/EBchecked/topic/77733/Georg-Brandt Encyclopedia Britannica: Georg Brandt] ]Brandt was born in
Skinnskatteberg parish,Västmanland County to Jurgen Brandt, a mineowner and pharmacist, and Katarina Ysing. He was professor of chemistry atUppsala University, and died inStockholm . He was able to show that cobalt was the source of the blue color in glass, which previously had been attributed to theBismuth found with cobalt.About 1741 he wrote: "As there are six kinds of metals, so I have also shown with reliable experiments... that there are also six kinds of half-metals: a new half-metal, namely Cobalt regulus in addition to Mercury, Bismuth,
Zinc , and the reguluses ofAntimony andArsenic ". He gave six ways to distinguish Bismuth and Cobalt which were typically found in the sameore s:#Bismuth fractures while Cobalt is more like a true metal.
#In fusing, they do not mingle but attach about as an almond and its stone.
#The regulus of Cobalt fuses with flint and fixed alkali giving a blue glass known as zaffera, sasre, or smalt. Bismuth does not.
#Bismuth melts easily and if kept melted, calcinates forming a yellow powder.
#Bismuth amalgamates with Mercury; the regulus of Cobalt does not at all.
#Bismuth dissolved in nitric acid and with aqua regia and gives a white precipitate when put in pure water. The regulus of Cobalt needs alkalies to precipitate, and then forms dark or black precipitates.References
External links
* [http://www.longwood.k12.ny.us/lhs/library/science/PeriodicTable/Brandt.htm Georg Brandt]
Persondata
NAME = Brandt, Georg
ALTERNATIVE NAMES =
SHORT DESCRIPTION = Discoverer of Cobalt
DATE OF BIRTH =June 26 1694
PLACE OF BIRTH =Skinnskatteberg ,Sweden
DATE OF DEATH =April 29 1768
PLACE OF DEATH =Stockholm, Sweden
Wikimedia Foundation. 2010.
