|AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Colorado > Siderite on Sphalerite var. Marmatite
|Siderite on Sphalerite var. Marmatite
|Eagle Mine, Gilman District, Eagle County, Colorado
|Lustrous black marmatite crystals, the iron-rich variety of the mineral species sphalerite, to 4 mm with translucent tan-colored rhombohedral siderite crystals to 4 mm. The surfaces of the siderite crystals have an overgrowth of siderite microcrystals. Collected ca. 1975
|For reference only
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