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Encyclopedia Britannica



CAIRNGORM

This article appears in Volume V04, Page 952 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BUN-CAL
CAIRNGORM , a yellow or brown variety of
quartz
 , named from Cairngorm or Cairngorum; one of the peaks of the Grampian Mountains in Banffshire,
Scotland
 . According to Mr E. H. Cunningham-Craig, the
mineral
  occurs in crystals lining cavities in highly-inclined veins of a fine-grained granite running through the coarser granite of the main mass: Shallow pits were formerly dug in the kaolinized granite for sake of the cairngorm andthe
mineral
  was also 'found as pebbles in the bed of the river Avon. Cairngorm is a favourite ornamental stone in
Scotland
 , being set in the lids of snuff-mulls, in the handles of dirks and in brooches for Highland costume. A
rich
  sherry-yellow colour is much esteemed.
Quartz
  of yellow, and brown colour is often known in
trade
  as " false
topaz
 ," or simply "
topaz
 ." Such quartz is found at many localities in Brazil, Russia and Spain. Much of the yellow quartz used in jewellery is said to be " burnt amethyst "; that is, it was originally amethystine quartz, the colour of which has been modified by heat (see AMETHYST). Yellow quartz is sometimes known as citrine;. when the quartz presents a
pale
  brown tint it is called " smoky quartz "; and when the brown is so deep that the stone appears almost black it is termed morion. The brown colour has been referred to. the presence of titanium.


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