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Home > Art, Film & Photography > Quartz Varieties: Quartz, Agate, Amethyst, Chalcedony, Flint, Opal, Chert, Jasper, Menilite, Carnelian, Fused Quartz, Petrified Wood
Quartz Varieties: Quartz, Agate, Amethyst, Chalcedony, Flint, Opal, Chert, Jasper, Menilite, Carnelian, Fused Quartz, Petrified Wood

Quartz Varieties: Quartz, Agate, Amethyst, Chalcedony, Flint, Opal, Chert, Jasper, Menilite, Carnelian, Fused Quartz, Petrified Wood


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About the Book

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 39. Chapters: Quartz, Agate, Amethyst, Chalcedony, Flint, Opal, Chert, Jasper, Menilite, Carnelian, Fused quartz, Petrified wood, Lake Superior agate, Onyx, Chrome chalcedony, Melanophlogite, Cristobalite, Tiger's eye, Seifertite, Stishovite, Coesite, Chrysoprase, Moganite, Tridymite, Shocked quartz, Pietersite, Herkimer diamond, Smoky quartz, Heliotrope, Cape May diamonds, Prasiolite, Ametrine, Moss agate, Mozarkite, Orbicular jasper, Fruit quartz, Phantom crystal, Hyalite, Akik, Geyserite, Rose de france, Fiorite, Enhydro agate. Excerpt: Quartz is the second most abundant mineral in the Earth's continental crust, after feldspar. It is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2. There are many different varieties of quartz, several of which are semi-precious gemstones. Especially in Europe and the Middle East, varieties of quartz have been since antiquity the most commonly used minerals in the making of jewelry and hardstone carvings. Quartz belongs to the trigonal crystal system. The ideal crystal shape is a six-sided prism terminating with six-sided pyramids at each end. In nature quartz crystals are often twinned, distorted, or so intergrown with adjacent crystals of quartz or other minerals as to only show part of this shape, or to lack obvious crystal faces altogether and appear massive. Well-formed crystals typically form in a 'bed' that has unconstrained growth into a void, but because the crystals must be attached at the other end to a matrix, only one termination pyramid is present. A quartz geode is such a situation where the void is approximately spherical in shape, lined with a bed of crystals pointing inward. Crystal structure of -quartz -quartz -quartz crystallizes in the trigonal crystal system, space g...


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Product Details
  • ISBN-13: 9781155774251
  • Publisher: Books LLC, Wiki Series
  • Publisher Imprint: Books LLC, Wiki Series
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Weight: 91 gr
  • ISBN-10: 1155774256
  • Publisher Date: 04 Sep 2011
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Quartz, Agate, Amethyst, Chalcedony, Flint, Opal, Chert, Jasper, Menilite, Carnelian, Fused Quartz, Petrified Wood
  • Width: 189 mm


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