New Mineral Found in Allende Meteorite
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In 1969, an exploding fireball tore through the sky over Mexico, scattering thousands of pieces of meteorite across the state of Chihuahua. The meteorite is still serving the scientific community as a rich source of information about the early stages of our Solar system’s evolution.
Dubbed panguite, the new titanium oxide is named after Pan Gu, the giant from ancient Chinese mythology who established the world by separating yin from yang to create the earth and the sky.
The mineral and the mineral name have been approved by the International Mineralogical Association’s Commission on New Minerals, Nomenclature and Classification. A paper outlining the discovery and the properties of this new mineral were published online in the journal American Mineralogist.
“Panguite is an especially exciting discovery since it is not only a new mineral, but also a material previously unknown to science,” said Dr Chi Ma, a senior scientist and director of the Geological and Planetary Sciences division’s Analytical Facility at Caltech and lead author of the paper.
The Allende meteorite is the largest carbonaceous chondrite – a diverse class of primitive meteorites – ever found on our planet and is considered by many the best-studied meteorite in history. As a result of an ongoing nanomineralogy investigation of primitive meteorites – which Dr Ma has been leading since 2007 – nine new minerals, including panguite, have been found in the Allende meteorite. Some of those new finds include the minerals allendeite, hexamolybdenum, tistarite, and kangite. Nanomineralogy looks at tiny particles of minerals and the minuscule features within those minerals.
“The intensive studies of objects in this meteorite have had a tremendous influence on current thinking about processes, timing, and chemistry in the primitive solar nebula and small planetary bodies,” explained co-author George Rossman, the Eleanor and John R. McMillan Professor of Mineralogy at Caltech.
Panguite was observed first under a scanning electron microscope in an ultra-refractory inclusion embedded in the meteorite. Refractory inclusions are among the first solid objects formed in our solar system, dating back to before the formation of Earth and the other planets. “Refractory” refers to the fact that these inclusions contain minerals that are stable at high temperatures and in extreme environments, which attests to their likely formation as primitive, high-temperature liquids produced by the solar nebula.
“Studies of panguite and other newly discovered refractory minerals are continuing in an effort to learn more about the conditions under which they formed and subsequently evolved. Such investigations are essential to understand the origins of our solar system,” Dr Ma said.
Bibliographic information: Ma C. et al. 2012. Panguite, (Ti4+,Sc,Al,Mg,Zr,Ca)1.8O3, a new ultra-refractory titania mineral from the Allende meteorite: Synchrotron micro-diffraction and EBSD. American Mineralogist, Volume 97, pages 1219–1225; doi: 10.2138/am.2012.4027
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