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He arrived at this from a study of calcite crystals of various habits and noted that the cleavage rhombohedra were always the same.
Access to the pit is prohibited, but excellent specimens of calcite scalenohedra, dolomite rhombohedra , pyrite, and marcasite have been collected from the pit's east wall.
Gilman pyrites typically have associated minerals, particularly flattened siderite rhombohedra and marmatite.
This Eagle mine is well known for dark spruce-green, rough-surfaced octahedra of fluorite associated with rhombohedra of rhodochrosite to 0.75 inch on edge.
Rhodochrosite from the Sunnyside mine generally forms pale pink to strawberry-pink simple rhombohedra on plates of drusy white quartz.
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