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Columbite : (Fe,Mn)(Nb,Ta)2O6 | |
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Etta Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA Columbite crystal, 1.9 cm. across, Etta Mine. Ex-Tom Loomis specimen via Dave Bunk. Kelly Nash specimen and photo. |
| Photo ID: 172746 View Count: 95 | |
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Etta Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA Crystal size: 5 cm Ex C. Nowak collection (France) Collection and photo: Arliguie M |
| © Arliguie M | Photo ID: 177019 View Count: 79 |
Rutile (Var: Strüverite) : (Ti,Ta,Fe)O2 | |
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Etta Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA Crystals of Strüverite in matrix from the Etta mine, Pennington co., S. Dakota, USA. Field of view: 2 cm. Specimen and photo: Knut Eldjarn. |
| © Knut Eldjarn | Photo ID: 54016 View Count: 443 |
Spodumene : LiAl[Si2O6] | |
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Etta Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA This is a 6 1/2 x 7 x 3 inch crystal segment from a big spodumene crystal from the Etta Mine. In the Charles Creekmur collection. |
| © Charles Creekmur | Photo ID: 19093 View Count: 358 |
Spodumene : LiAl[Si2O6] | |
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Etta Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA Terminated spodumene crystal approximately 9 cm x 7.5 cm. |
| © Stephen E. Fritz | Photo ID: 134732 View Count: 115 |
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