| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Colorado > Siderite on Sphalerite var. Marmatite |
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| DESCRIPTION: | No. 77859 |
| Mineral: | Siderite on Sphalerite var. Marmatite |
| Locality: | Eagle Mine, Gilman District, Eagle County, Colorado |
| Description: | 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 |
| Overall Size: | 26x23x20 mm |
| Crystals: | 0.5-4.0 mm |
| Archived: | For reference only |
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