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Composition of pipe wall scale upstream or downstream from the SBS injection point, as determined by XRD analysis
| Mineral or compound | Chemical formula | % upstream | % downstream |
|---|---|---|---|
| Siderite | FeCO3 | 85–95% | 55–65% |
| Iron carbonate hydroxide | Fe2(OH)2CO3 | 4–8% | 0% |
| Quartz (sand) | SiO2 | 4-8% | 0% |
| Sulfur | S8 | 0% | 20–30% |
| Mackinawite | FeS | 0% | 10–20% |
| Iron | Fe0 | Trace | 0% |
