Berilo Esmeralda
Berilo is a mineral with formula Be₃Al₂(Si₆O₁₈). This specimen comes from Panjshir, Afghanistan.
Description
Elongate prismatic emerald crystal, blue-green and translucent, with pronounced longitudinal striations. Grows partly free on a pale altered quartz matrix, with scattered small black crystals.
History of this specimen
Large emerald piece, 447 ct.
About Berilo
Green variety of beryl, coloured by traces of chromium and vanadium.
About the locality
Panjshir Valley in the Afghan Hindu Kush. Historic high-mountain emerald district, with artisanal mining and difficult conditions. Emeralds grow in hydrothermal veins with quartz, calcite, pyrite and black tourmaline. Since the 1980s, Panjshir has held a place of its own among the world’s major emerald localities.
Technical data
- Catalogue No.
- 0415
- Internal reference
- T0022
- Composition
- Be₃Al₂(Si₆O₁₈)
- Name
- Berilo
- Variety
- Esmeralda
- Province
- Panjshir
- Country
- Afghanistan
- Size (cm)
- 7.6 × 4.2 × 3
- Weight
- 89.4 g
- Etymology
- Okenite is named in honour of the German naturalist Lorenz Oken (1779–1851) for his contribution to nineteenth-century science. It was first described in 1828.
- Quality
- Buena
- Value trend
- Estable
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