| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Minnesota > Groutite |
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| DESCRIPTION: | No. 48400 |
| Mineral: | Groutite |
| Locality: | Robert Mine, Cuyuna Range, Crow Wing County, Minnesota |
| Description: | Uncommonly large cluster of lustrous black groutite crystals in a banded formation of groutite and Mn-oxides. This specimen from the private collection an old miner at the mine. See article: Groutite From the Robert Mine in Mineral News v.2 #5. |
| Overall Size: | 7.5x5x3.5 cm |
| Crystals: | 1-4 mm |
| Archived: | For reference only |
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