Lipscombite: Small green crystals on quartz, Harvard Museum of Natural History
|Crystal class||Trapezohedral (422)
(same H-M symbol)
|Unit cell||a = 5.37, c = 12.81 [Å]; Z = 4|
|Formula mass||391.27 g/mol|
|Color||Green gray, olive green, black.|
|Optical properties||Translucent to opaque|
Lipscombite is often formed at meteorite impact sites where its crystals are microscopically small, because crystal-forming conditions of pressure and temperature are brief.
In the classification of minerals lipscombite is in the lipscombite group, which also includes zinclipscombite. This group is within the non-silicate, category 8, anhydrous phosphates, lazulite supergroup.
While investigating the stability relations of iron oxides small, black, shiny crystals were obtained when a spherical iron pressure-temperature vessel was contaminated with phosphorus. The x-ray powder diffraction pattern was similar to lazulite, but unknown.
Gruner, a mineralogist at the University of Minnesota, gave Lipscomb, a chemistry professor there, the crystals for Lewis Katz and Lipscomb to determine the atomic structure using single-crystal x-ray diffraction. They initially called the mineral iron lazulite.
- Lipscombite on Mindat
- Lipscombite data on WebMineral
- Gheith, M. A. , Lipscombite: A New Synthetic Iron Lazulite, Amer. Mineral., 38, 612-628 (1953)
- Structures and Mechanisms: From Ashes to Enzymes (Acs Symposium Series) Gareth R. Eaton (Editor), Don C. Wiley (Editor), Oleg Jardetzky (Editor), American Chemical Society, Washington, DC (2002) (Autobiographical sketch by William Lipscomb, 14 pp. (Lipscombite: p. xvii). This chapter is online at pubs.acs.org. Click PDF symbols at right.
- Gheith, Mohamed A. Stability relations of ferric oxides and their hydrates. Lipscombite: a new synthetic iron lazulite. Thesis Univetsity of Minnesota (1951)
- Katz L., Lipscomb W. N. The crystal structure of iron lazulite, a synthetic mineral related to lazulite: Acta Crystallographica, 4, 345-348 (1951).
Gallery of lipscombite pictures at mindat.org.
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