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- Quartz R.I. 1-544 --- 1-553; S.G. 2-65 to 2-66; H. 7; Trigonal; Colours, colourless (Rock Crystal), violet (Amethyst), yellow (Citrine), brown (Cairngorm), pink (Rose Quartz), green (Prase), green chatoyant (Cat's-eye), yellow chatoyant (Tiger's-eye), blue (Siderite), brown, yellow, red or green with scales of mica (Aventurine), colourless with cracks showing prismatic colours (Iris), colourless with included acicular crystals of rutile, etc. (Sagenitic quartz, Rutilated quartz, Venus' or Thetis hair stone). Quartz, owing to its piezo-electric effect, is used in radio frequency control, etc. See also chalcedony.
- Quartz glass fused quartz which thereby loses its crystalline character and becomes a glass. S.G. 2 21; R.I. 1 46.
- Quartzite a metamorphic rock made up of irregular interlocking grains of quartz. Often contains flakes of green mica or a reddish iron mineral. Such types with coloured or spangled inclusions are known as aventurine quartz.
- Quoin facets the name applied to the other four facets adjacent to the bezel facets, on the crown in a brilliant-cut stone. These eight facets, the quoins and bezels are often called collectively the bezels or kites.