| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Tanzania > Cordierite var. Iolite (Viking Compass) |
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| DESCRIPTION: | No. 82516 |
| Mineral: | Cordierite var. Iolite (Viking Compass) |
| Locality: | Manyara Region, Tanzania |
| Description: | Transparent iolite gem rough, 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. Weight: 2.2 grams. Ex. Miller collection T1814; acquired in 1997 from S. Ulatowski from old stock |
| Overall Size: | 13x13x10 mm |
| Crystals: | |
| Archived: | For reference only |
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