Read e-book online Rocks & Minerals (DK Eyewitness Books) PDF

By R.F. Symes

ISBN-10: 0756637775

ISBN-13: 9780756637774

The main depended on nonfiction sequence out there, Eyewitness Books offer an in-depth, accomplished examine their matters with a different integration of phrases and images. DK's vintage examine rocks and minerals, now reissued with a CD and wall chart.

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Extra info for Rocks & Minerals (DK Eyewitness Books)

Example text

The difference in their properties is caused by different arrangements of carbon atoms. Graphite Carbon atom Model of diamond structure Model showing how one atom is bonded to four others Model of graphite structure In graphite, a hexagonal mineral formed under high temperature, each carbon atom is closely linked to three others in the same plane. The structure is made of widely spaced layers that are only weakly bonded together. Graphite is one of the softest minerals (Mohs' scale 1-2), and its loose bonding enables it to leave marks on paper, which is why it is used in pencils.

Black opals Milky opal White opal Fire opal The finest fire opal comes from Mexico and Turkey and is generally cut as faceted stones. It is valued for the intensity and rainbow quality of its colors. Opal’s rocky origins Most opal forms over long periods of time in sedimentary rocks, as in this sample from Australia. However, in Mexico and Czechoslovakia opal forms in gas cavities in volcanic rocks. It is often cut as cabochons (p. 60). " 51 (c) 2011 Dorling Kindersley. All Rights Reserved. Decorative stones T urquoise, agate, lapis lazuli, and jade are all gems made up of many crystals.

Very finely powdered material was also used as a skin make up and has been employed as a fine polishing medium (jewelers’ rouge). c. Egyptians first crushed realgar, an arsenic compound found in hot-spring deposits, to form an orange pigment. Medieval artists preferred to use the mineral cinnabar. Powdered orpiment Powdered malachite Malachite green paint BRILLIANT GREEN Malachite, a copper compound, produces a rich bright green. It was first used during the Bronze Age in Egypt. King’s yellow paint FOOL’S GOLD Medieval artists used orpiment, an arsenic compound, to make many colors and to imitate gold.

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Rocks & Minerals (DK Eyewitness Books) by R.F. Symes

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