Research Article
Gemological and Spectral Characteristics of Gem-Quality Blue Gahnite from Nigeria
Table 1
The gemological characteristics of gahnite.
| Samples | RI | Weight | Specific gravity | UV fluorescence | Weight (air) | Weight (water) | Long-wave | Short-wave |
| S01 | 1.793 | 0.494 | 0.387 | 4.617 | Inert | Inert | S02 | 1.793 | 0.423 | 0.330 | 4.548 | Inert | Inert | S03 | 1.793 | 0.440 | 0.343 | 4.536 | Inert | Inert | S04 | 1.792 | 0.433 | 0.337 | 4.510 | Inert | Inert | S05 | 1.793 | 0.282 | 0.219 | 4.476 | Inert | Inert | S06 | 1.794 | 0.256 | 0.198 | 4.414 | Inert | Inert | S07 | 1.792 | 0.300 | 0.235 | 4.615 | Inert | Inert | S08 | 1.794 | 0.316 | 0.247 | 4.580 | Inert | Inert | S09 | 1.793 | 0.202 | 0.157 | 4.489 | Inert | Inert | S10 | 1.794 | 0.305 | 0.238 | 4.552 | Inert | Inert | S11 | 1.794 | 0.094 | 0.073 | 4.476 | Inert | Inert | S12 | 1.793 | 0.134 | 0.105 | 4.621 | Inert | Inert | S13 | 1.792 | 0.205 | 0.159 | 4.457 | Inert | Inert | S14 | 1.792 | 0.070 | 0.055 | 4.667 | Inert | Inert | S15 | 1.793 | 0.207 | 0.161 | 4.500 | Inert | Inert | Average | 1.793 | 0.277 | 0.216 | 4.537 | Inert | Inert |
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