Crookesite is an opaque, bluish grey to pink toned brown metallic mineral crystallizing in the tetragonal system. It has a Mohs hardness of 2.5 to 3 and a specific gravity of 6.9. Name and discovery. It was discovered in 1866 in Skrikerum, Sweden and named for Sir William Crookes (1832–1919), the discoverer of the element thallium.
Crookesite: Eriksson L, Werner P E, Berger R, Meerschaut A (1991) Structure refinement of TlCu7Se4 from X-ray powder profile data Journal of Solid State Chemistry 90 61-68: 1991: synthetic: 0: 293: 0013692: Crookesite
Crookesite definition is - a mineral (Cu,Tl,Ag)2Se consisting of selenide of copper, thallium, and silver occurring in lead-gray metallic-looking masses (specific gravity 6.9).
General Crookesite Information : Chemical Formula: Cu7(Tl,Ag)Se4 : Composition: Molecular Weight = 940.92 gm Thallium 16.29 % Tl: Copper 47.28 % Cu: Silver 2.87 % Ag: Selenium 33.57 % Se: 100.00 %
Associated minerals are: berzelianite, bellidoite, cadmoseite (mercurian and cuprian), chameanite, crookesite, eskebornite, eucairite, ferroselite, hakite ...
Crookesite definition, a rare mineral, selenide of copper, thallium, and silver, (Cu, Tl, Ag)2Se, occurring in steel-gray, compact masses. See more.
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Crookesite mineral data, information about Crookesite, its properties and worldwide locations.
Berger R A (1987) Crookesite and sabatierite in a new light - A crystallographer's comment, Zeitschrift für Kristallographie, 181, 241-249 Johan Z (1987) La crookesite, TlCu 7 Se 4: nouvelles données et isotypie avec NH 4 Cu 7 S 4, Comptes Rendus de l'Académie des Sciences de Paris, 304, 1121-1124
Sir William Crookes OM PRS (/ k r ʊ k s /; 17 June 1832 – 4 April 1919) was a British chemist and physicist who attended the Royal College of Chemistry in London, and worked on spectroscopy.He was a pioneer of vacuum tubes, inventing the Crookes tube which was made in 1875. This was a foundational discovery that eventually changed the whole of chemistry and physics.