Triclinic Section – Rhodonite Composition & Structure

Composition. Manganese metasilicate, MnSiO₃ = Silica 45.9, manganese protoxide 54.1. Iron, calcium and sometimes zinc replace a part of the manganese.

Crystallization. Triclinic. Crystals commonly tabular parallel to be (Fig. 306). Crystals often rough with rounded edges.

Structure. Commonly rnassive, cleavable to compact; in embedded grains.

Physical Properties. Prismatic cleavage at about 92°. H. = 6-6.5. G. - 3.63. Vitreous luster. Color rose-red, pink, brown. Translucent to opaque.

Tests. Fusible (3-3.5) to a nearly black glass. Insoluble in hydrochloric acid. In 0. F. Gives clear reddish violet color to borax beat.

Occurrence. Found at Langban, Sweden, with iron ore; found in large masses near Yekaterinburg, Urals; from Broken Hill, New South Wales. A zinciferous variety, known as fowlerite, occurs in good-sized crystals in limestone with franklinite, willemite, zineite, ete., at Franklin Furnace, New Jersey.

Name. Derived from the Greek word for a rose, in allusion to the color.

Use. Sometimes polished for use as an ornamental stone.

Obtained chiefly from the Urals.

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