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Encyclopedia Britannica



MOCHA STONE

This article appears in Volume V18, Page 637 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: MIC-MOL
MOCHA STONE , a name applied to
chalcedony
  with dendritic markings, said to have been obtained originally from Mocha in Arabia. The markings which sometimes simulate with curious fidelity the form of miniature trees and shrubs, are caused by the infiltration of solutions carrying
iron
  and
manganese
 , which are deposited as thin films of
oxide
  along the cracks of the stone, producing black, brown or red dendrites, effectively disposed on a ground of grey or
white
 
chalcedony
 . Most of the Mocha stones of commerce are obtained from India, where they are found among the agate-pebbles resulting from the disintegration of the
trap
  rocks of the
Deccan
 . In
recent
  years the formation of dendrites has been artificially effected at the agate-works of
Oberstein
 , so as to imitate the true Mocha stones.


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