L Impact-Melt Work in Progress ... A rock that is a mechanical mixture of different minerals and/or rock fragments (clasts). A breccia may also be distinguished by the origin of its clasts: (monomict breccia: monogenetic or monolithologic, and polymict breccia: polygenetic or polylithologic). The proportions of these fragments within the unbrecciated material Click on Term to Read More
(L5 in MetBull 75)
Found 1980/81, recognized 1993
32° 8.9′ N., 111° 6.7′ W. In Tucson, Arizona, a man named William Goldups walked his dog along the same path near his home on a daily basis. One day he discovered a rather large, dark stone that had not previously been there. He brought it home and placed it on his Main silicate-rich zone within a planet between the crust and metallic core. The mantle accounts for 82% of Earth's volume and is composed of silicate minerals rich in Mg. The temperature of the mantle can be as high as 3,700 °C. Heat generated in the core causes convection currents in Click on Term to Read More where it remained until after his death in 1990. The rock was inherited by a friend, who took it to the University of Arizona’s Inorganic substance that is (1) naturally occurring (but does not have a biologic or man-made origin) and formed by physical (not biological) forces with a (2) defined chemical composition of limited variation, has a (3) distinctive set of of physical properties including being a solid, and has a (4) homogeneous Click on Term to Read More Museum. An X-ray powder diffraction test determined that Group of silicate minerals, (Mg,Fe)2SiO4, with the compositional endpoints of forsterite (Mg2SiO4) and fayalite (Fe2SiO4). Olivine is commonly found in all chondrites within both the matrix and chondrules, achondrites including most primitive achondrites and some evolved achondrites, in pallasites as large yellow-green crystals (brown when terrestrialized), in the silicate portion Click on Term to Read More was present. The Work in progress. A solid natural object reaching a planet’s surface from interplanetary space. Solid portion of a meteoroid that survives its fall to Earth, or some other body. Meteorites are classified as stony meteorites, iron meteorites, and stony-iron meteorites. These groups are further divided according to their mineralogy and Click on Term to Read More was then taken to the Lunar and Planetary Laboratory (D. Kring) where it was analyzed by electrom microprobe and reflectance spectrography, which conclusively determined that it was a meteorite. The name Cat Mountain corresponds to the southern-most peak of the Tucson Mountains, located about 2 miles NW from the site of the Meteorite not seen to fall, but recovered at some later date. For example, many finds from Antarctica fell 10,000 to 700,000 years ago. Click on Term to Read More. In 2011 two additional paired stones were recovered on Snyder Hill, a few hundred yards from the location of the Largest fragment of a meteorite, typically at the time of recovery. Meteorites are commonly cut, sliced or sometimes broken thus reducing the size of the main mass and the resulting largest specimen is called the "largest known mass". Click on Term to Read More. These include a 107.2 g stone found in March by Mike Holden and classified as Cat Mountain 001 (Bunch and Wittke, NAU), and a 162 g stone found in August by Count Guido Deiro and classified as Cat Mountain 002 (Bunch and Wittke, NAU).
Photo credit: Terri Haag, ‘Chasing Cosmic Rain’, Lapidary Journal, p. 47, April 1994