As reported by the BBC: " On Christmas Eve 1965, a very strange event occurred in the Leicestershire village of Barwell...
There was a blinding flash in the sky, followed by a loud bang.
Recent years have produced almost exclusively broken, field weathered and/or dirt stained stones, and, on at least one occasion, a prospective buyer was beaten by banditos. So, while most collectors cannot afford an SNC ("Mars rock") and few in the world have a piece of the earth's moon, you can easily afford an excellent specimen of likely Mars' lunar material!
Brearley Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, USA Received 26 July 1994; accepted 3 March 1995. Abstract The petrological and mineralogical characteristics of the unusual CM2 chondrite, Bells, have been investigated in detail by scanning electron microscopy (SEM), electron microprobe analysis (EPMA), and transmission electron microscopy (TEM).
Bells is a highly brecciated chondrite which contains few intact chondrules, a very low abundance of refractory inclusions, and is notable in having an unusually high abundance of magnetite, which is disseminated throughout the fine-grained matrix.
The unusual fine-grained mineralogy of Bells matrix can be reasonably attributed to the combined effects of aqueous alteration and advanced brecciation in a parent body environment.
Extensive brecciation has assisted aqueous alteration by reducing chondrules and mineral grains into progressively smaller grains with high surface areas, which are more susceptible to dissolution reactions involving aqueous fluids.
It also contains the oldest material in the solar system as well as diamonds. The author devotes five pages to Allende and the text contains multiple photographs of this stone throughout the book.
Few specimens have been recovered in recent years due to the extensive initial field collecting and subsequent thorough combing of the area by local inhabitants for sale to collectors. Among the other many interesting aspects of Allende, unmanned probes have indicated that the only formation in the solar system which has the same refractive qualities and weight/mass ratio as Allende is Phobos, one of the moons of Mars!The dominant phases are fine-grained saponite interlayered with serpentine, and phases such as tochilinite and cronstedtite, which are typical of CM chondrite matrices, are entirely absent.Pentlandite, pyrrhotite, magnetite, anhydrite, calcite, and rare Ti-oxides also occur as accessory phases.This has resulted in the preferential dissolution of Fe-rich chondrule olivines, which are now completely absent in Bells although present in other CM chondrites. This is the most popular material I have ever sold.The formation of saponite in Bells probably resulted from the dissolution of relatively silica-rich phases, such as pyroxene and olivine, that were derived from chondrules. Absolutely loaded with multisized, multicolored chondrules. The owner of the main masshas raided the price substantially. I am continually fascinated by the variety in the L classifications.Patios and rooftops in Allende, Mexico were pelted by a huge rain of stones which more than doubled the then weight of all known CV3 material .