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Chalcedony pendentif Just as rock crystal gave us a starting point in the enumeration of the varieties of crystallized quartz, so the relatively colorless gel variety of silica known as chalcedony constitutes a point of departure in the discussion of quartz gemstones of this phase. Chalcedony is translucent rather than transparent and is [...] green aventurine gemstone An ornamental variety of quartz which encloses minute flakes of hematite or mica is called aventurine, and should not be confused with the feldspar gemstone of the same name. The small scales enclosed within this stone reflect back the light in a highly pleasing manner. A green aventurine enclosing fine [...] Tiger eye gemstone A variety of amphibole asbestos which is known as crocidolite occurs in the neighborhood of Griquatown, West South Africa, where the silk-like fibers of this mineral have been impregnated with quartz. Originally this stone was colored a grayish blue. During the infiltration of the silica, however, the iron oxide which [...] rose quartz The pink or rose red quartz, which may owe its color to titanium, belongs among the gem stones derived from crystallized quartz, although it is very seldom found in actual crystals. The color is ordinarily more or less translucent, the clearer varieties often having a close resemblance to light colored rubellite. [...]
critrine stone A light yellow variety of quartz, which probably owes its color to a trace of ferric iron, was much used in the Victorian period and was erroneously called “topaz.” The more proper designation for this stone is citrine, but the term “topaz” has been so long in use among jewelers in connection [...] |
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