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Author: John Mastin Publisher: ISBN: 9781034143628 Category : Languages : en Pages : 90
Book Description
"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.""
Author: John Mastin Publisher: ISBN: 9781034143628 Category : Languages : en Pages : 90
Book Description
"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.""
Author: John Mastin Publisher: Forgotten Books ISBN: 9780484107457 Category : Science Languages : en Pages : 128
Book Description
Excerpt from The Chemistry, Properties and Tests of Precious Stones 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. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: John Mastin Publisher: CreateSpace ISBN: 9781507718575 Category : Fiction Languages : en Pages : 72
Book Description
"[...]contrary be wholly, or almost wholly, composed of upper-earth-crust materials, carried deep down by water, and subjected to the action of the same time and pressure; the simpler the compound, the more perfect and important the result, as seen in the diamond, the ruby, and the like. CHAPTER III. [...]."
Author: Henry G. Smith Publisher: ISBN: 9781332237326 Category : Science Languages : en Pages : 116
Book Description
Excerpt from Gems and Precious Stones: With Descriptions of Their Distinctive Properties; The Methods for Determining Them, &C In the preparation of the following notes on "Gems and Precious Stones" for re-publication, in a form more suited to the requirements of the general public, it has been recognised that many who feel an interest in these useful and valuable minerals may have had but little scientific training, and whose knowledge of gems only extends to those cut and polished specimens used in articles of adornment. The endeavour has, therefore, been made to simplify the information, by ignoring scientific expressions and highly technical terms as much as possible, but where the use of these was unavoidable, explanatory notes have been added to elucidate their meaning. It may be well to mention that the natural minerals have but little resemblance to the finished gems as prepared for sale, and while an attempt has been made to convey the meaning and appearance of simple crystalline forms in the four principal systems, it must be understood that it is seldom that the natural crystals are perfect in form, or regular in appearance. This might tend to mislead one little acquainted with the laws that govern form in minerals, although a little consideration would enable one to place a crystallized specimen in its proper system; the diamond, the zircon, and the sapphire for instance, could not be mistaken for each other when found crystallized, although, perhaps, identical in colour. In water-worn specimens, of course, other tests have to be applied, these are fully described in the following pages, and the differences pointed out between gems resembling each other in some respects. The methods adopted in determining the physical properties of minerals are also fully explained. It has been attempted, by introducing well authenticated historical facts, to enliven an otherwise rather dry subject with interesting narrative, much of which has been obtained from the information collected and published by Messrs. Streeter, Emanuel, King, Dieulafait, Kunz, Burnham, and others. To the authors of these works my obligations are due. While endeavouring to make the information of some educational value, it must be understood that no attempt has been made to write for those who are already scientifically acquainted with the subject, as they are well provided for by very many works of reference. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Henry G. Smith Publisher: Hardpress Publishing ISBN: 9781290096126 Category : Languages : en Pages : 118
Book Description
Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.
Author: Frank Bertram Wade Publisher: Good Press ISBN: Category : Fiction Languages : en Pages : 155
Book Description
This American textbook aims to make the understanding and recognition of gemstones easier not only for the jewel merchant but also for the general public. The author was a chemist skilled in the analysis of precious gems.
Author: B. Anderson Publisher: Read Books Ltd ISBN: 1447494652 Category : Nature Languages : en Pages : 322
Book Description
This vintage book contains a complete guide to testing gems and gemstones for purity and authenticity. Complete with a plethora of useful illustrations and all the information a prospective or existing enthusiast might need to know about the subject, this book constitutes an ideal resource for anyone with an interest in lapidary and gem testing. The chapters of this volume include: “How to Use this Book”, “Refractive Index and its Measurements”, “Double Refraction and How to Detect It”, “Colour, Colour Filters and Dichroscope”, “The Specific Gravity of Gem-Stones and How to Measure It”, “Detection of Synthetic and Imitation Stones”, “The Use of the Microscope”, etcetera. This antiquarian book is being republished now in an affordable, modern edition - complete with a specially commissioned new introduction on gemmology.
Author: John Mastin
Author: John Mastin
Author: John Mastin
Author: John Mastin
Author: John Mastin
Author: John Mastin
Author: John MASTIN (R.B.A., F.R.M.S.)
Author: Henry G. Smith
Author: Henry G. Smith
Author: Frank Bertram Wade
Author: B. Anderson