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Vanadium-bearing beryl
A variety of 'Aquamarine' [Beryl]
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About Vanadium-bearing beryl
Formula:
Be3Al2(Si6O18)
Colour:
âelectro-opticalâ green, (blue-green)
Recently, a vanadium-bearing beryl of Nigerian origin with a distinctive green (blue-green) color has emerged within the international jewelry market. Initially misidentified as African Paraiba blue-green tourmaline due to its similar color and luster, it was subsequently determined to be vanadium-bearing beryl.
Unique Identifiers
Mindat ID:
472129 (as Vanadium-bearing beryl)
819 (as Beryl)
819 (as Beryl)
Long-form identifier:
mindat:1:1:472129:7 (as Vanadium-bearing beryl)
mindat:1:1:819:6 (as Beryl)
mindat:1:1:819:6 (as Beryl)
Physical Properties of Vanadium-bearing beryl
Colour:
âelectro-opticalâ green, (blue-green)
Comment:
The broad UV-Vis-NIR absorption bands at 427 and 610 nm are characteristic of V3+ (and a minor amount of Cr3+). Charge transfer between Fe2+ and Fe3+ may also contribute to the 610 nm band, which is superimposed on the absorption bands of V3+ and Cr3+. These factors primarily contribute to the blue-green coloration of beryl. The absorption induced by V3+ in the visible violet-blue region exhibits stronger intensity and a greater tendency towards the blue region compared to Cr3+. Consequently, the resultant vanadium-bearing beryl acquires the yellow-green hue (induced by V) overlaid with the light blue (induced by charge transfer between Fe2+-Fe3+ pairs), resulting in the so-called âelectro-opticalâ green (blue-green) beryl.
Chemistry of Vanadium-bearing beryl
Mindat Formula:
Be3Al2(Si6O18)
Element Weights:
Elements listed:
Common Impurities:
Fe,V,Cr,Ba,Ca,Cu,Zn,K
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| SiO2 | 76.48 % |
| Al2O3 | 22.36 % |
| FeO | 0.79 % |
| V2O3 | 0.07 % |
| Cr2O3 | 0.04 % |
| BaO | 0.15 % |
| CaO | 0.06 % |
| CuO | 0.01 % |
| Total: | 99.96 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Nigeria | X-ray fluorescence spectroscopy. Reference did not determine Be. |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Vanadium-bearing beryl
mindat.org URL:
https://www.mindat.org/min-472129.html
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References for Vanadium-bearing beryl
Localities for Vanadium-bearing beryl
Showing 1 localities.
â - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Nigeria | |
Nigeria