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Table IV Theoretical bond distances and coordination numbers for Se and S-bearing minerals

From: Micro-spectroscopic investigation of selenium-bearing minerals from the Western US Phosphate Resource Area

Sample Shell R (Å)a CNb
Ferroselite (FeSe2)d    
  Se–Fe 2.34–2.38 ( = 2.37) 3
  Se–Se 2.50 1
  Se–Se 3.15 1
  Se–Se 3.29–3.58 ( = 3.39) 10
  Se–Fe 3.74–3.91 ( = 3.85) 3
Dzharkenite (FeSe2)e    
  Se–Se 2.28 1
  Se–Fe 2.42 3
  Se–Se 3.29–3.55 ( = 3.42) 12
  Se–Fe 3.67–3.87 ( = 3.72) 4
  Se–Fe 4.75 3
Pyrited    
  S–S 2.14 1
  S–Fe 2.26 3
  S–S 3.08–3.32 ( = 3.20) 12
  S–Fe 3.43–3.61 ( = 3.48) 4
  S–Fe 4.44 3
Marcasited    
  S–S 2.21 1
  S–Fe 2.23–2.25 ( = 2.24) 3
  S–S 2.97–3.38 ( = 3.19) 11
  S–Fe 3.48–3.60 ( = 3.56) 3
  1. aBond distances.
  2. bCoordination number.
  3. cWeighted average used for ΔR calculation (see Table III).
  4. dReference 43.
  5. eReference 44.