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Nambulite - Gozaisho mine, Iwaki City, Fukushima Prefecture, Japan (#:MINS8429)

From an extinct manganese mine in Japan. Specimen with burnt-orange Nambulite on black braunite matrix.

Formula :
(Li,Na)Mn42+[Si5O14(OH)]
System: triclinic Hardness:6½ Rarity:very rare
Strunz id:VIII/F.27-50 - SILICATES
Name origin: Named in 1972 by M. Yoshii, Y. Aoki, and K. Maeda in honor of Matsuo Nambu (南部 松夫) (19 November 1917, Soma City, Fukushima Prefecture - 21 August 2009), economic geologist, Tohoko University, Sendai, Japan, who is known for his research in manganese minerals.

Specimen weight:60 gr.
Crystal size:-
Overall size: 40mm x 25 mm x 33 mm

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Nambulite - Gozaisho mine, Iwaki City, Fukushima Prefecture, Japan

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