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The violet to purple amethyst is the most important and best known gem variety of quartz and has been used for lapidary works since ancient times.
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Un libro (del latín liber, libri) es una obra impresa, manuscrita o pintada en una serie de hojas de papel, pergamino, vitela u otro material, unidas por un lado (es ...
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Sheet silicates (phyllosilicates) An important group of minerals, especially within the topmost 20 kilometers of the crust. All sheet silicates are hydrous.
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This is a small piece of industrially produced pure silicon. It is a light (density g/cm 3), gray crystalline substance with strong metallic luster.
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China has been the source of many innovations, scientific discoveries and inventions. This includes the Four Great Inventions: papermaking, the compass, gunpowder ...
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Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an ...
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Why is one type of iron and steel harder or softer than another? In all this discussion of iron and steel, you'll have noticed that different types behave almost like ...
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Hexagonal ferrites: A review of the synthesis, properties and applications of hexaferrite ceramics
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the Color of Art Pigment Database: Pigment Red, is a complete artist's reference on red pigments used in making paint. It includes the Color Index names, chemical ...
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For centuries, people in today's midNorway Trøndelag region made large amounts of firstclass iron out of bog ore for use in weapons and tools. Production peaked ...
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Chapter 1 Stoichiometry 1 1. 0 INTRODUCTION Chemistry A Molecular Science (CAMS), the first half of this twovolume sequence, stressed bonding, structure, and ...
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THE CHEMISTRY OF TRANSITION METALS. Their chemical properties and chemical reactions (d) (i) Form coloured compounds and ions in solution. There are several important ...
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