|Unit cell||a = 9.781(1) Å,
b = 9.778(2) Å,
c = 9.815(1) Å; Z=16
|Crystal habit||Microscopic inclusion|
|Crystal symmetry||Orthorhombic dipyramidal
H-M symbol: (2/m 2/m 2/m)
Space group: Pbca
|Specific gravity||3.746 (calculated)|
The mineral’s chemical formula is (Ti4+,Sc,Al,Mg,Zr,Ca)1.8O3. The elements found in it are titanium, scandium, aluminium, magnesium, zirconium, calcium, and oxygen. Samples from the meteorite include some which are zirconium rich. The mineral was found in conjunction with the already identified mineral davisite, within an olivine aggregate.
Origin and properties
Panguite is in a class of refractory minerals that formed under the high temperatures and extremely varied pressures present in the early solar system, up to 4.5 billion years ago. This makes panguite one of the oldest minerals in the Solar System. Zirconium is a key element in determining conditions prior to and during the Solar System’s formation.
Chi Ma, director of the Geological and Planetary Sciences division’s Analytical Facility at the California Institute of Technology was the lead author of its first peer-reviewed article, published in American Mineralogist. Ma has been leading a nano mineralogy investigation, since 2007, of primitive meteorites, including the well studied Allende meteorite. The mineral was first described in a paper submitted to the 42nd annual Lunar and Planetary Science Conference in 2011.
- Panguite on Mindat.org
- 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
- "Caltech scientists find new primitive mineral in meteorite". Eurekalert. 26 June 2012. Retrieved 26 June 2012.
- Ma, Chi; Oliver Tschauner; John R. Beckett; Boris Kiefer; George R. Rossman; Wenjun Liu. "Discovery of Panguite, a New Ultra-Refractory Titania Mineral in Allende" (PDF). 42nd Lunar and Planetary Science Conference (2011). Retrieved 28 June 2012.