A Handbook to a Collection of the Minerals of the British Islands: Mostly Selected from the Ludlam Collection, in the Museum of Practical Geology, Jermyn Street, London, S.W. (Google eBook)

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H.M. Stationery Office, 1905 - Geological museums - 241 pages
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The section on the chemicals responsible for the color of amethyst is the smartest, critical thinking I encountered after reading 20 previous search results, including more recent information and including university, government, and Wikipedia websites. There is much disagreement and diversity about this subject and this writing made everything make sense. 

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Page 7 - FRS &c., Director of the Ordnance Geological Survey. Published by Order of the Lords Commissioners of HM Treasury. 8vo. with Maps, Woodcuts, and 12 large Pates, 14s.
Page 33 - Touching metals : Copper is found in sundry places, but with what gain to the searchers I have not been curious to enquire, nor they hasty to reveal ; for at one mine (of which I took a view) the ore was shipped to be refined in Wales, either to save cost in fuel, or to conceal the profit.
Page 97 - FRS, has a paper on the manner of occurrence of Beekite and its bearing upon the origin of siliceous beds of Palaeolithic age.
Page 197 - Pyritologia : or, a History of the Pyrites, the Principal Body in the Mineral Kingdom.
Page 222 - Guide to the Collections of Rocks and Fossils belonging to the Geological Survey of Ireland, arranged in the curved gallery of the Museum of Science and Art, Dublin,
Page 82 - Garby that specimens of uranite " when first discovered by the miners in Huel Buller and Huel Basset were very phosphorescent, so much so that after the lights were extinguished many of the crystals might be discovered in situ ",* and he has suggested that this may be in some way connected with the self-luminosity of radio-active bodies.
Page 21 - Sir Henry De la Beche's Report on the Geology of Cornwall, Devon, and West Somerset, and in the Transactions of the Royal Geological Society of Cornwall.
Page 82 - ... of the Primitive Crystal and its modifications, including an attempt to ascertain with precision the admeasurement of the angles, by means of the reflecting Goniometer of Dr. Wollaston : to which is added a series of its crystalline forms and varieties.
Page 109 - It was not until the early part of the eighteenth century that the flint-lock musket with a bayonet finally displaced the pike in the equipment of the infantry.
Page 159 - The Geology of the Northern Part of the English Lake District

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