Hello List, Richard wrote: "Chladnite? I see this fall is now classified as a diogenite but could anyone discuss the term Chladnite a bit more?
----------------------------------------------------------------------------------------- TSCHERMAK G. (1885) Die mikroskopische Beschaffenheit der Meteoriten (Stuttgart E. Schweizerbart'sche Verlagshandlung, E. Koch, 23 pp.). English Translation: The Microscopic Properties of Meteorites, Vol. 4, No. 6 (Smithsonian Contributions to Astrophysics, Washington, D.C., 1964). Translation by J.A. Wood and E.M. Wood. Excerpts: Chladnites This combination of minerals has been found in only one meteorite, Bishopville. The stone is coarse grained and consists mostly of friable snow white enstatite. Rose observed other white grains, but could not identify them. I find these to be plagioclase. The third constituent is pyrrhotite. The stone's crust has a marbled appearance, being partly colorless, partly black, white, bluish, and gray. Enstatite occurs in large and small grains, mostly large. I observed distinct crystal boundaries on one of the small grains, ...The grains are cut by many fine, irregular cracks ... Plagioclase is usually attached to the small enstatite grains...Pyrrhotite forms large and small grains... The analysis of Rammelsberg (1861), which found Al2O3, CaO, and alkalis in small amounts, in addition to the ingredients of enstatite, is in full agreement with the microscopic description just given. Rose also reports small amounts of nickel-iron and a black mineral that sometimes fills fine cracks. Breaking the stone along such cracks, I observed a shiny material, similar to that in meteorites to be described later, in which the veins consist of iron, pyrrho- tite, and silicate glass... Diogenites This class differs little in mineralogy from the preceding one. The main constitutent is bronzite or hypersthene; these minerals and enstatite are members of the same series. Therefore the d i s t i n c t i o n between *chladnite* and *diogenite* depends only on c o n t e n t of f e r r o u s o x i d e. ---------------------------------------------------------------------------------------------- Regards, Bernd ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
