| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from India > Cordierite var. Iolite (Viking Compass) |
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| DESCRIPTION: | No. 81579 |
| Mineral: | Cordierite var. Iolite (Viking Compass) |
| Locality: | India |
| Description: | Polished transparent iolite, the transparent color-change variety of the mineral species cordierite. The iolite color changes from blue-purple to yellowish when rotated and depending on illumination angle, a characteristic used by Viking navigators. |
| Overall Size: | 29x20x14 mm |
| Crystals: | |
| Archived: | For reference only |
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