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Encyclopedia Britannica



RHODONITE

This article appears in Volume V23, Page 270 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: RAY-RHU
RHODONITE , a member of the pyroxene group of minerals, consisting of manganese metasilicate, MnSiO3, and crystallizing in the anorthic
system
 . It commonly occurs as cleavable to compact masses with a rose-red colour; hence the name, from the Greek 1 YSov (a rose). Crystals often have a thick tabular habit; there are perfect cleavages parallel to the prism faces with an
angle
  of 87 312'. The hardness is 52-627 and the specific gravity 3.4-3.68. The manganese is often partly replaced by iron and
calcium
 , which may sometimes be present in considerable amounts; a greyish-brown variety containing as much as 20% of
calcium
 
oxide
  is called " bustamite " ; " fowlerite " is a zinciferous variety containing 7% of zinc
oxide
 . Rhodonite is a
mineral
  liable to alteration, with the formation of manganese carbonate, hydrous silicate or oxides. The compact material, which is cut and polished for ornamental purposes, is often marked in a striking manner by veins and patches of these black alteration products. At Syedelnikova, near Ekaterinburg in the Urals, compact material of a good colour occurs in a clay-slate and is extensively quarried: boulders of similar material found at Cummington ,in
Massachusetts
  (" cummingtonite f7) have also been worked as an ornamental stone. In the iron and manganese mines at Pajsberg near Filipstadt and Langban in Vermland, Sweden, small brilliant and translucent crystals (" pajsbergite ") and cleavage masses occur. Fowlerite occurs as large, rough crystals, somewhat resembling
pink
  felspar, with
franklinite
  and zinc ores in granular limestone at Franklin Furnace in New
Jersey
 .


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