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A single, ex-matrix, inky blue cubic crystal of Boleite makes an eye-catching specimen from the Amelia mine at Santa Rosalía (El Boleo) in Baja California Sur, Mexico. This large crystal measures a generous 1.1 x 1.1 x 1.0 cm and is opaque with a thin, outer semi-translucent rind. The Boleite, a complex potassium-lead-silver-copper oxychloride, is deep indigo blue, like a pool of ink with a bright reflective lustre. It's a superb small thumbnail specimen.