| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Connecticut > Cordierite var. Iolite |
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| DESCRIPTION: | No. 79912 |
| Mineral: | Cordierite var. Iolite |
| Locality: | Route 9 road cut at Beaver Meadow Road, Haddam, Middlesex County, Connecticut |
| Description: | Polished specimen of cordierite in quartz with black schorl tourmaline. The cordierite has small (1-3 mm) gem sections that shows plechroism when rotated from blue-purple to pale yellow. It is said the Vikings used cordierite to navigate on cloudy days. |
| Overall Size: | 25x22x15 mm |
| Crystals: | |
| Archived: | For reference only |
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