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
." 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
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.
End of Article: CAIRNGORM
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