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Table 2 Induction time and total reaction times, and final solid products of the hydrothermal transformation of mackinawite to pyrite a).

From: Greigite: a true intermediate on the polysulfide pathway to pyrite

Temperature Induction Times (min) b) Reaction Time (min) Products (ED-XRD)
  t-0 mack t+0 grei t+0 pyr   
200°C c) 0 8 0 90 Pyrite
200°C c) 0 4 0 70 Pyrite, Greigite
175°C 7 n.a.d) 6 60 Pyrite, Greigite
150°C 4 6 12 74 Pyrite, Greigite
125°C 25 (± 3) n.a. 22 110 Pyrite
100°C 77 (± 19) n.a. 117 (± 30) 311 e) Mackinawite, Pyrite
  1. a) All experiments: 1.25 ± 0.13 mmol FeS and 1.25 ± 0.13 mmol zerovalent S as polysulfide.
  2. b) Mean errors in induction times, unless stated otherwise: ± 1. t-0 mack: induction time for mackinawite decay; t+0 grei, t+0 pyr: induction time for greigite and pyrite growth, respectively.
  3. c) The reaction at 200°C was conducted in duplicate.
  4. d) n.a.: not available.
  5. e) Reaction was interrupted before completion.
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