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Encyclopedia Britannica



CROCIDOLITE

This article appears in Volume V07, Page 477 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: CRE-DAH
CROCIDOLITE , a
mineral
  described in 1815 by M. H. Klaproth under the name Blaueisenstein (blue ironstone), and in 1831 by J. F. Hausmann, who gave it its present name on account of its nap-like
appearance
  (Gr. KpoKUS, nap of cloth). It is a blue fibrous
mineral
  belonging to the amphibole group and closely related to riebeckite; chemically it is an iron sodium silicate. Its resemblance to asbestos has gained for it the name Cape Asbestos, the
chief
  occurrence being in Cape Colony. The mineral suffers alteration by removal of alkali and peroxidation of the ferrous iron, and further by deposition of
silica
  between the
fibres
 , or by their replacement by
silica
 ; a hard siliceous mineral is thus formed which when polished shows, in con-sequence of its fibrous structure, a beautiful chatoyance or silky lustre. This is the ornamental stone which is known when blue as " hawk's-eye," and when of
rich
  golden brown colour as " tiger-eye." The latter, which represents the final alteration of the crocidolite, has become very fashionable as "
South
 
African
  cat's eye," and is often termed " crocidolite," though practically only a mixture of quartz with brown
oxide
  of iron. The following are analyses by A. Renard and C. Klement of the unaltered crocidolite and of the blue and brown products of alteration:
Crocidolite. Hawk's-eye. Tiger-eye.
Silica ~ 51'89 93 45 93 05
Ferric
oxide
  19.22 2.41 4.94
Alumina . . . . .. 0.23 0.66
Ferrous oxide . 17.53 1.43
Magnesia
  . 2.43 0.22 0.26
Lime 0.40 0.13 0.44
Soda 7.71
Potash 0.15
Water 2.36 0.82 0.76
Total . . Io1.69 98.69 Ioo11
Another alteration product of the crocidolite, consisting of silica and ferric hydrate, has been called griqualandite. Crocidolite and the minerals resulting from its alteration occur in seams, associated with magnetite and other iron-ores, in the jasper-slates of the Asbestos Mountains in Griqualand West,
Cape Colony. It is known also from a few other localities, but only in subordinate quantity. (See CAT'S-EYE.)


End of Article: CROCIDOLITE


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