Georgerobinsonite, named for
George Willard Robinson
George may refer to:
People
* George (given name)
* George (surname)
* George (singer), American-Canadian singer George Nozuka, known by the mononym George
* George Washington, First President of the United States
* George W. Bush, 43rd President ...
, is a
lead chromate mineral with
formula
In science, a formula is a concise way of expressing information symbolically, as in a mathematical formula or a ''chemical formula''. The informal use of the term ''formula'' in science refers to the general construct of a relationship betwee ...
Pb
4(CrO
4)
2(OH)
2FCl.
[ It exhibits very small, transparent crystals with a bright orange-red color.][ It was obtained from the Mammoth–St. Anthony Mine in Arizona in the 1940s and identified in 2009.
]
History
The type specimen for georgerobinsonite was found in the Mammoth–St. Anthony Mine in Tiger, Arizona.[ The sample was collected by Dan Mayers in 1943 or 1944. At this time, the mine was operating at a level where a number of exotic minerals have been discovered.][Cooper, p. 866.] The exact location of its origin is unknown, but it is likely from the Collins vein at the 500 level.[Cooper, p. 867.]
The sample, labelled M 117 by Mayers, was donated along with many others to the Department of Mineralogy at Harvard
Harvard University is a private Ivy League research university in Cambridge, Massachusetts. Founded in 1636 as Harvard College and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of higher le ...
. Professor Heinrich Meixner obtained it in the 1950s in an exchange with the curator of Harvard's mineral collection, Professor C. Frondel.[Cooper, pp. 866–67.] Werner H. Paar then acquired it in the early 1970s. Several years prior to 2011, reexamination of M 117 revealed very small crystals of an orange-red mineral. They were initially misidentified as wulfenite, but later determined to be a new mineral species.[
In November 2009, the Commission on New Minerals, Nomenclature and Classification of the ]International Mineralogical Association
Founded in 1958, the International Mineralogical Association (IMA) is an international group of 40 national societies. The goal is to promote the science of mineralogy and to standardize the nomenclature of the 5000 plus known mineral species. Th ...
(IMA) designated the mineral as IMA 2009-068.George Willard Robinson
George may refer to:
People
* George (given name)
* George (surname)
* George (singer), American-Canadian singer George Nozuka, known by the mononym George
* George Washington, First President of the United States
* George W. Bush, 43rd President ...
,[ ]A. E. Seaman Mineral Museum
The A.E. Seaman Mineral Museum, currently located on the campus of Michigan Technological University in Houghton, Michigan, is the official mineral museum of the state of Michigan and is a heritage site of the Keweenaw National Historical Park. Th ...
curator since 1996 and mineralogy professor at Michigan Technological University
Michigan Technological University (Michigan Tech, MTU, or simply Tech) is a public research university in Houghton, Michigan, founded in 1885 as the Michigan Mining School, the first post-secondary institution in the Upper Peninsula of Michigan. ...
.
Properties
Georgerobinsonite is a soft, brittle mineral that forms crystals less than across. The mineral possesses a pale-orange streak and an adamantine luster
Lustre (British English) or luster (American English; see spelling differences) is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin ''lux'', meaning "light", and generally imp ...
.[ It is most strongly associated with cerussite and diaboleite.][
]
References
Bibliography
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External links
Photos from mindat.org
Lead minerals
Chromate minerals
Orthorhombic minerals
Minerals in space group 59