File:A glossary of mineralogy (1861) (14597159799).jpg

Identifier: glossaryofminera00bris (find matches)
Title: A glossary of mineralogy
Year: 1861 (1860s)
Authors: Bristow, Henry William, 1817-1889
Subjects: Mineralogy
Publisher: London, Longman, Green, Longman, and Roberts
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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apoor,in the Mahratta empire. The Koh-i-noorwas found in the former district at Purteal,between Hyderabad and Masulipatam, butnow there are only one or two places of ex-ploration, and the mines have gradually be-come all but valueless, since the discovery ofthe diamond mines of Brazil in 1728. Dia-monds also occur in Bundelcund, near Panna,and on the Mahanuddy, near Ellore. * Vol. ii. p. 84. t An interesting history of the Koh-i-noor willbe found in R. Hunts Handbook of the Great Ex-hibiiion of iHil. See also Utes Dictionary of Ails,S;c. 5th Edition, vol. 11., p. 17, art. Diamond. 112 DIAMOND. Diamonds, when cut, are called Brilliants,rose Diamonds or rosettes, and table Dia-monds. Of these the brilliant displays thelustre of the stone to the greatest advan-age, and is the most esteemed. DIAMOND. The following figures (148 to 164) show-ing the different forms and sizes of pohshedDiamonds, will render intelligible tie vari-ous modes of cutting them better than amere verbal description.
Text Appearing After Image:
Fig. 163. Fig. 162. Fig. 148. Oval Brilliant.Fig. 149. Oval Brilliant, under side.Fig. 150. Brilliant of 1 carat.• Fig. 151. Brilliant of 10 carats.Fig. 152. Brilliant of 20 carats.Fig. 153. Round Brilliant,Fig. 154. Round Brilliant, under side.Fig. 155. Drop Brilliant.Fig. 156. Drop Brilliant, under side. Jn Jigs lis to 152 the horizontal lines bene;stone, and the small facets below the horizontal Fig. 164. Fig. 157. Rose Diamond of 1 carat.Fig. 158. Rose Diamond of 10 carats.Fig. 159. Rose Diamond of 20 carats.Fig. 160. Round Rose Diamond.Fig. 161. Oval Rose Diamond.Fig. 162. Drop Hose Diamond.Fig. 163. Side view of Brilliant.Fig. 164. Side view of Rose Diamond. !th each figure represent the depth of thelines in figs. 150 to 152 the size of the collet. DIAMOND SPAR.Diamonds appear to occur generally incountries where there is a laminated rockcalled Itacolumite. They are procured bywashing, either from the soil or from super-ficial deposits. At Minas Geraes in theBrazils, there are

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