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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.