Rhodonite

Rhodonite is a mineral, magnesium silicate, very rare in the form of crystals. It is better known as ornamental stone, in which besides it black dendrites and veins of manganese hydroxides and oxides, brown sections of bustamite and other inclusions occur, giving a polished surface very nice and interesting look. It is even used in the decoration of columns of one of the metro stations in Moscow.
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