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The crystals are perched on quartz along with rosin-colored sphalerite showing the black tarnish reported by Hurst.
Most of the sphalerite in the Eagle mine is marmatite, the black iron-rich variety.
Black sphalerite is found within the gold-quartz vein and in the adjacent country rock.
Marmatite is the black, high-iron variety of sphalerite .
With sphalerite , it is one of the rarest minerals of the pillow basalts.
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