Nuummite rond 10mm demi ou 1 fil de perles (env. 15 pouces/36cm)
Nuummite / Astrophyllite, Rond
Taille : Environ 10 mm (+/-0,5 mm)Taille du trou : Environ 1 mm
Couleur : Noir
Rond, avec quelques irrégularités.
Il s'agit de perles rondes de Nuummite chinoise (Astrophyllite Nuummit). Selon un gemmologue, c'est une pierre mixte composée de plusieurs minéraux. Une évaluation distincte d'une forme différente a listé "Anthophyllite", "Quartz" et "Staurolite" comme les trois composants principaux, et a également indiqué la présence de "Grenat". Un tel résultat est très rare. Avec une base noire, elle comprend des zones transparentes de quartz et des zones marron/grises d'autres minéraux, affichant un chatoiement linéaire similaire à la Pietersite.
[*La grille utilisée dans l'image est de 1 cm x 1 cm.]
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