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By Peter G. Read

ISBN-10: 0750664495

ISBN-13: 9780750664493

On account that Gemmology was once first released, hundreds of thousands of readers have used it to realize an in-depth appreciation of the technological know-how of gemmology, its historical past and perform. This 3rd version has been revised to hide, specifically, This 3rd version has been revised to hide, particularly, new HPHT diamond enhancement equipment and beryllium lattice diffusions strategies for corundum in addition to the low strain hot temperature CVD synthesis of thick movie diamond

It comprises information of the Gemmological institutions lately brought beginning direction, and offers exam notes.

* comprises crucial details for the Gem-A exams
* totally up to date to hide fresh advances and instruments
* a useful source for gemmologists world wide

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3 A rhombohedron of the Iceland spa variety of calcite showing incipient cleavage in three directions easily cleaves into even smaller rhombohedra, each of which is an identical copy of its parent. Even if one of these is crushed to powder, the individual particles will all be found to be minute rhombohedra when viewed under the microscope. If it were possible to continue this process of dismantling the calcite crystal down to the molecular level, we would finally arrive at calcite’s basic building block.

In ‘low’ zircon, this metamict state has been caused by the presence within the gemstone of small amounts of radioactive uranium and thorium. The rare gem mineral ekanite, which was discovered in the Sri Lankan gem gravels during the 1960s, is also a metamict material and contains enough thorium to activate a Geiger radiation counter! Chapter 5 Cleavage, parting and fracture The mechanism of cleavage The cleavage property of a gemstone is of particular interest to the lapidary and the diamond cutter.

Of these eight elements, oxygen and silicon are the dominant pair, and it is these two elements which combine together with the remaining six elements, aluminium, iron, calcium, sodium, potassium and magnesium, to form silicate minerals such as the aluminium-silicate feldspars. Any remaining silicon combines with oxygen to form silica (SiO2). Silica is found worldwide as quartz and makes up around 12% of the Earth’s crust and upper mantle. For convenience, all elements are identified by letter symbols.

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Gemmology by Peter G. Read

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