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Events January–March * January 6 – Treaty of Constantinople: The Ottoman Empire agrees to Russia's annexation of the Crimea. * January 14 – The Congress of the United States ratifies the Treaty of Paris with Great Britain to end the American Revolution, with the signature of President of Congress Thomas Mifflin.''Harper's Encyclopaedia of United States History from 458 A. D. to 1909'', ed. by Benson John Lossing and, Woodrow Wilson (Harper & Brothers, 1910) p167 * January 15 – Henry Cavendish's paper to the Royal Society of London, ''Experiments on Air'', reveals the composition of water. * February 24 – The Captivity of Mangalorean Catholics at Seringapatam begins. * February 28 – John Wesley ordains ministers for the Methodist Church in the United States. * March 1 – The Confederation Congress accepts Virginia's cession of all rights to the Northwest Territory and to Kentucky (Illinois County). * March 22 – The Emerald ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emerald Buddha, August 2012, Bangkok
Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium or sometimes vanadium.Hurlbut, Cornelius S. Jr., and Kammerling, Robert C. (1991). ''Gemology'', John Wiley & Sons, New York, p. 203, . Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds have many inclusion (mineral), inclusions, so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate. Etymology The word "emerald" is derived (via and ), from Vulgar Latin: ''esmaralda/esmaraldus'', a variant of Latin ''smaragdus'', which was via (smáragdos; "green gem"). The Greek word may have a Semitic, Sanskrit or Persian origin. According to ''Webster's Dictionary'' the term emerald was first used in the 14th century. Properties determining value Emeralds, like all colored gemstones, are graded using four basic parameters known as "the four ''C''s": ''color'', ''clarity,'' ''cut'' and ''carat weight''. No ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
