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Geochemistry

, Volume 4, Issue 1, pp 89–96 | Cite as

Crystal structure of daqingshanite

  • Ximen Lulu 
  • Peng Zhizhong 
Article
  • 22 Downloads

Abstract

Daqinshanite, a new mineral recently discovered in China, is a kind of strontium-rare earth-bearing phosphate-carbonate. The ideal formula is: (Sr, Ca, Ba), RF(PO4)(CO3)3. The mineral belongs to the trigonal system. The intensity data were collected with a single-crystal four-circle diffractometer. The lattice parameters are given as:a=10.058(±0.002) Å;c=9.225(±0.003) Å. Space group=R3m,Z=3. The crystal structure was solved by Patterson and electron density synthesis methods. The least-squares refinement led to a final conventional factorR=0.079.

Crystal structural analysis shows that daqingshanite is of calcite-type structure and the ordered model of cations is similar to that of huntite (Mg3Ca(CO3)4).

Keywords

Bond Distance Coordination Polyhedron Axial Ratio R3ra Trigonal System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 1985

Authors and Affiliations

  • Ximen Lulu 
    • 1
  • Peng Zhizhong 
    • 1
  1. 1.Beijing Graduate School of Wuhan Geological CollegeChina

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