AIGUE-MARINE (BÉRYLE) SUR SCHORL (TOURMALINE NOIRE) ET MUSCOVITE, AFGHANISTAN (petit cabinet)
AIGUE-MARINE (BÉRYLE) SUR SCHORL (TOURMALINE NOIRE) ET MUSCOVITE, AFGHANISTAN (petit cabinet)
Le béryl est un minéral composé de silicate d'aluminium et de béryllium, de formule chimique Be₃Al₂Si₆O₁₈. Parmi les variétés les plus connues de béryl figurent l'émeraude et l'aigue-marine. Bien que présent à l'état naturel, le béryl se présente sous forme de cristaux hexagonaux pouvant atteindre plusieurs mètres de longueur, les cristaux bien formés et terminés sont rares. Si le béryl pur est incolore, il arbore souvent diverses couleurs dues à des impuretés, notamment le vert, le bleu, le jaune, le rose et, plus rarement, le rouge. Le béryl constitue également un minerai important pour l'extraction du béryllium.
Ce spécimen contient également du schorl (tourmaline noire) et de la muscovite.
Dimensions : 70 25 31 mm (2 cristaux d'aigue-marine sur ce spécimen)
AFGHANISTAN
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