The Chemistry, Properties and Tests of Precious Stones (Esprios Classics) - Mastin, John
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"What constitutes a precious stone is the question which, at the onset, rises in the mind, and this question, simple as it seems, is one by no means easy to answer, since what may be considered precious at one time, may cease to be so at another. There are, however, certain minerals which possess distinctive features in their qualities of hardness, colour, transparency, refractability or double refractability to light-beams, which qualities place them in an entirely different class to the minerals of a metallic nature. These particular and non-metallic minerals, therefore, because of their…mehr

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Produktbeschreibung
"What constitutes a precious stone is the question which, at the onset, rises in the mind, and this question, simple as it seems, is one by no means easy to answer, since what may be considered precious at one time, may cease to be so at another. There are, however, certain minerals which possess distinctive features in their qualities of hardness, colour, transparency, refractability or double refractability to light-beams, which qualities place them in an entirely different class to the minerals of a metallic nature. These particular and non-metallic minerals, therefore, because of their comparative rarity, rise pre-eminently above other minerals, and become actually "precious.""
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Autorenporträt
John Mastin was a 19th-century British chemist and mineralogist who specialized in the study of gemstones. He is best known for his book, "The Chemistry, Properties, and Tests of Precious Stones," which remains a classic text in the field of gemology. His book quickly became a standard reference for gemologists, jewelers, and anyone interested in the study and appreciation of precious stones. In addition to his work on gemstones, Mastin made contributions to the fields of metallurgy and chemistry. He was a member of the Royal Society of Arts and Sciences and the Society of Arts and Manufacturers, and he received numerous awards and honors for his work. Hereby, John Mastin was a respected expert in the science of gemstones and made significant contributions to the fields of chemistry, mineralogy, and metallurgy. His book on the chemistry, properties and tests of precious stones remains a valuable resource for gemologists and jewelry enthusiasts today.