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Encyclopedia Britannica



COBALTITE

This article appears in Volume V06, Page 605 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: CLI-COM
COBALTITE , a
mineral
  with the composition CoAsS,
cobalt
  sulpharsenide. It is found as granular to compact masses, and frequently as beautifully developed crystals, which have the same symmetry as the isomorphous
mineral
  pyrites, being cubic with parallel hemihedrism. The usual forms are the
cube
 ,
octahedron
  and pentagonal
dodecahedron
  {210}. The colour is silver-
white
  with a reddish tinge, and the lustre brilliant and metallic, hence the old name
cobalt
 -glance; the streak is greyish-black. The mineral is brittle, and possesses distinct cleavages parallel to the faces of the
cube
 ; hardness 51; specific gravity 6.2. The brilliant crystals from Tunaberg in Sodermanland and Hakansboda in Vestmanland,
Sweden
 , and from Skutterud near Drammen in Norway are well known in mineral collections. The cobalt ores at these localities occur with pyrites and chalcopyrite as bands in gneiss. Crystals have also been found at Khetri in Rajputana, and under the name sehta the mineral is used by Indian jewellers for producing a blue enamel on gold and silver ornaments. Massive cobaltite has been found in small amount in the Botallack mine,
Cornwall
 . A variety containing much iron replacing cobalt, and known as ferrocobaltite (Ger. Stahlkobalt), occurs at
Siegen
  in Westphalia. (L. J. S.)


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