Assertion: siderite's sulfur | /r/HasProperty | s
Facets:
Source sentences:
text: Sulfur (S) is a frequent contaminant in coal.
text: Moreover, Sulfur (S) included in the iron ore in the form of sulfate or sulfide can act as a reducing agent.
text: Sulfur (S) occurs as irregular masses, as earthy coatings on other substances, and as fine crystals.