Aegirine-augite (Var: Urbanite)
Noda-Tamagawa mine, Noda, Kunohe-gun, Iwate Prefecture, Japan
6.8 x 3.6 x 2.5 cm. An incredibly rare specimen of the now discredited "urbanite" from the Noda-Tamagawa manganese mine in Japan. The piece features bronze-brown crystals in rhodonite matrix. This is one of only a handful of pieces of this material that we've seen, and is accompanied by a classic label from Josef Vajdák/Pequa Rare Minerals, but ...
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