| Gilman pyrites typically have associated minerals, particularly flattened siderite rhombohedra and marmatite. |
| The fine-grained sediment of the matrix is composed chiefly of siderite, with lesser amounts of illite, calcite, quartz, and bitumen. |
| This cavity may then be filled with coal, calcite, siderite, or any other form of sediment. |
| Overgrowths of fine-grained, bronze-colored siderite are often present on selected faces of the fluorite crystals. |
| Other carbonates, i.e., ankerite, siderite, witherite, strontianite, may form if the respective metal cations are available. |
| A few sharp rhombic crystals of rhodochrosite without siderite coating were also found in the Eagle mine. |
