The compression behavior of a natural vanadinite has been investigated using in situ angle-dispersive X-ray diffraction and a diamond anvil cell up to 8.74GPa, respectively. No phase transition of vanadinite was observed within the experimental pressure range. The isothermal equation of state was determined. The values of Ko, and A refined with a third-order BirchMumaghan equation of state are K-o = 55 1 GPa and A = 6.1 +/- 0.5 for vanadinite. Furthermore, we obtained that the axial compressibilities of the natural vanadinite (6.94 x 10(-3)GPa(-1) and 3.83 x 10(-3)GPa(-1)for the a- and c-axis of vanadinite, respectively). In addition, combining with previous results, the compositional dependence of the bulk modulus and its pressure derivative of vanadinite are discussed.

Publication name	HIGH TEMPERATURES-HIGH PRESSURES  Volume:42   Issue:5   Pages:441-449   Published:2013
Author(s)	Fan, Dawei; Ma, Maining; Wei, Shuyi; Chen, Zhiqiang; Xie, Hongsen
Corresponding author	FAN Dawei  fandawei@vip.gyig.ac.cn    Chinese Acad Sci, Inst Geochem, Lab High Temp & High Pressure Study Earths Interi, Guiyang 550002, Peoples R China.

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