AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Colorado > Siderite on Sphalerite var. Marmatite

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Siderite on Sphalerite var. Marmatite from Eagle Mine, Gilman District, Eagle County, Colorado

 
Siderite on Sphalerite var. Marmatite from Eagle Mine, Gilman District, Eagle County, Colorado

Siderite on Sphalerite var. Marmatite from Eagle Mine, Gilman District, Eagle County, Colorado

Siderite on Sphalerite var. Marmatite from Eagle Mine, Gilman District, Eagle County, Colorado

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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