Other precious stones, including the sapphire, emerald, oriental emerald, ruby, opal, amethyst, garnet, chrysolite, topaz, cairngorm, onyx, zircon, &c., have been found in the gold and tin bearing drifts and river gravels in numerous localities throughout the states.
On exposure to heat, amethyst generally becomes yellow, and much of the cairngorm or yellow quartz of jewellery is said to be merely "burnt amethyst."
BEN MACDHUI, more correctly BEN MuICHDHUI (Gaelic for "the mountain of the black pig," in allusion to its shape), the second highest mountain (4296 ft.) in Great Britain, one of the Cairngorm group, on the confines of south-western Aberdeenshire and south-western Banffshire, not far from the eastern boundary of Inverness-shire.
The summit of Cairngorm, 31 m.
For particulars respecting the special characters, modes of occurrence and localities of the more important varieties of quartz, reference may be made to the following articles: AGATE, AMETHYST, AVENTURINE, BLOODSTONE, CAIRNGORM, CARNELIAN, CAT'S-EYE, CHALCEDONY, CHRYSOPRASE, FLINT,HELIOTROPE,JASPER, MOCHASTONE, ONYX, ROCK-CRYSTAL, SARD, SARDONYX.