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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Smithsonian Institution Mineral Reference Collection No. M14655-00 |
| Tappen,Christine,Smith,Michael and Dockal,James (2006) Beryl (Aquamarine,Emerald,Green and Yellow) and Tourmaline of the Crabtree Pegmatite,Spruce Pine District,Mitchell County,North Carolina Proceedings of the 42nd Forum on the Geology of Industrial Minerals at Asheville, North Carolina,Information Circular 34, NCGS |
| C.W. Allen collection Excalibur Mineral Corporation specimen |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |