Panguite

Panguite is a type of titanium oxide mineral first discovered as an inclusion within the Allende meteorite, and first described in 2012.[3][4]

Panguite
General
Category	Oxide mineral
Formula (repeating unit)	(Ti^4+,Sc,Al,Mg,Zr,Ca)1.8O3
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space group	Pbca
Unit cell	a = 9.781(1) Å, b = 9.778(2) Å, c = 9.815(1) Å; Z = 16
Identification
Crystal habit	Microscopic inclusion
Specific gravity	3.746 (calculated)
References	[1][2]

The hitherto unknown meteorite mineral was named for the ancient Chinese god Pan Gu, the creator of the world through the separation of yin (earth) from yang (sky).[3]

Composition

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.[5]

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.

Discovery

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.[2] 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.[6]

See also

• Glossary of meteoritics

References

1. Panguite on Mindat.org
2. 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
3. "Caltech scientists find new primitive mineral in meteorite". Eurekalert. 26 June 2012. Retrieved 26 June 2012.
4. Jeanna Bryner (26 June 2012), "1969 fireball meteorite reveals new ancient mineral", NBCNews.com, archived from the original on 3 January 2013
5. Wired
6. 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". 42nd Lunar and Planetary Science Conference (2011). Retrieved 28 June 2012.