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Numanoite: Ca4CuB4O6(OH)6(CO3)2 Borcarite: Ca4MgB4O6(OH)6(CO3)2
Comments: Zoned borcarite (Bc) crystal with a core of green numanoite (Nm). CanMin 45:307.
Location: Fuka mine, 40 km west-northwest of Okayama City, western Japan.
Scale: See Image.
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