24° 53′ S., 117° 38′ E. The first fragments of this unusually metal-rich, unbrecciated Used in past as synonym for Aubrites. Present definition from the Meteoritical Bulletin states that this rare class is an "enstatite-rich achondrite that has not yet been classified into a group". Click on Term to Read More were found by an Australian prospector, with subsequent recoveries bringing the total combined weight to ~22 kg. Mount Egerton is a very weathered 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 containing minor amounts of Si-bearing Element that readily forms cations and has metallic bonds; sometimes said to be similar to a cation in a cloud of electrons. The metals are one of the three groups of elements as distinguished by their ionization and bonding properties, along with the metalloids and nonmetals. A diagonal line drawn Click on Term to Read More both as a host phase and as inclusions within a predominant brown-stained A mineral that is composed of Mg-rich pyroxene, MgSiO3. It is the magnesium endmember of the pyroxene silicate mineral series - enstatite (MgSiO3) to ferrosilite (FeSiO3). Click on Term to Read More phase. The meteorite is composed primarily of cm-sized enstatite crystals with inhomogeneously distributed FeNi-metal composing ~21 wt%—a large abundance for any Aubrites are named for the Aubres meteorite that fell in 1836 near Nyons, France. They are an evolved achondrite that is Ca-poor and composed mainly of enstatite (En100) and diopside (En50Wo50) with minor amounts of olivine (Fa0) and traces of plagioclase (An2-8). They contain large white crystals of enstatite as Click on Term to Read More. Minor abundances of diopside and various sulfides are present (Cr-bearing Brass colored non-magnetic Fe sulfide, FeS, found in a variety of meteorites., brezinaite, Magnesium sulfide found in aubrites and EL chondrites. Its formula is MnS. Click on Term to Read More); notably, Mount Egerton contains no An alumino-silicate mineral containing a solid solution of calcium, sodium and potassium. Over half the Earth’s crust is composed of feldspars and due to their abundance, feldspars are used in the classification of igneous rocks. A more complete explanation can be found on the feldspar group page. Click on Term to Read More (Watters and Prinz, 1980).