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Lumachella

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142 GEMS.
  
 
 
  
 
The lumachella is also found in Piedmont and in France.
There is a great quantity in the Antilles and in the East.
It is not used in jewellery, but only in making useful articles, as snuff-boxes, vases, and clocks.
  
 
 
  
 
LIX.
LUNARIA, OR MOONSTONE.
It is under this name, described by some as the adularla, that the English know the moonstone, or pietra di luna.
LX.
MALACHITE.
The name of this mineral comes from the Greek word μαλάχη, which signifies mallows, and was given on account of its colour.
However, it is not certain that the ancients under­stood by this term the same substance to which we now apply it.
. Theophrastus says, " The malachite is a false emerald," and Pliny,* under the name of molochites, speaks of
 
a mineral which " is not transparent, is of a deep green colour, and is found in Arabia."
  
 
 
  
 
 
  
 
 
  
 
 
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