The Leoville CV3.0 Accretionary Breccia
Is it the World's Best
(internally) Oriented Chondrite?
100g thin slice of the Leoville carbonaceous chondrite in the
author's collection. Slices such this one are a special treat in
that rarely does one have the chance to see so much cosmic type
3.0 real estate at one time.
As if the almost perfect chondrules and breccia were not enough, the abundant and large white calcium aluminum inclusions (CAIs) May contain material older than our solar system!
|This is an excerpt from the article showing the sequence of events that May have led to the unique structure of Leoville.|
|The white puff of presolar dust floats gently in chondritic space like a nebula cloud in some distant galaxie.|
Another graphic from the article showing the orientation
of the deformed chondrules allowing for calculations
defining the degree and direction of the deformation.
Note that the CAI in the upper center of the diagram is the same one as in the upper left of the above photograph.
|Looking like reptilian scales on some prehistoric creature, Leoville's bazarre oriented chondrules, and most importantly the CAIs, literally stretch prehistory to well beyond the early solar nebula.|
|This graphic from the article shows the average shape and orientation of the deformed chondrules on the surface region of Leoville under study.|
|What makes this study of a particular slice of Leoville special to me is that the very slice used in the research now sits in my collection. The 1986 article pictures the slice exactly the same as is today which means is that all the diagrams, measurements, calculations, and conclusions pertain directly to my slice. All the calculations, that is, except the horizontal dimension which is listed in the photo caption as 6 cm, but is actually closer to 10 cm.|
|As with many of the specimens that moved through the hands of the American Meteorite Laboratory, this slice of Leoville gained a coveted AML specimen card along the way.|