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" value. It is cut with a convex surface. The largest mass of which we have any knowledge, is in the imperial cabinet of Vienna; it has almost the size of a man's fist, and weighs 17 ounces, but contains numerous fissures, and is not entirely disengaged... "
A System of Mineralogy: Including an Extended Treatise on Crystallography ... - Page 344
de James Dwight Dana - 1837 - 571 pages
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A system of mineralogy: comprising the most recent discoveries: including ...

James Dwight Dana - 1850 - 711 pages
...precious opal, when large, and exhibiting its peculiar play of colors in perfection, is a gem of high value. It is cut with a convex surface. The largest...entirely disengaged from the matrix. This stone was used as a gem by the Greeks and Romans, and was called opalus; alsopmderos, wailtpus, in allusion to...
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Manual of mineralogy: including observations on mines, rocks, reduction of ...

James Dwight Dana - 1851 - 432 pages
...delicate tints. Composition, silica 90, water 10, (Klaproth.) This variety forms a gem of rare beauty. It is cut with a convex surface. The largest mass of which we have any knowledge is in the imperlai cabinet of Vienna ; it weighs 17 ounces, and is nearly as large as a man's fist, but contains...
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A System of Mineralogy: Comprising the Most Recent ..., Volumes 1 à 2

James Dwight Dana - 1854 - 533 pages
...precious opal, when large, and exhibiting its peculiifr play of colors in perfection, is a gem of high value. It is cut with a convex surface. The largest...knowledge, is in the imperial cabinet of Vienna; it is nearly as large as a man's fist, and weighs 17 ounces, but contains numerous fissures, and is not...
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A System of Mineralogy Comprising the Most Recent Discoveries

James D. Dana - 1854
...precious opal, when large, and exhibiting its peculiar play of colors in perfection, is a gem of high value. It is cut with a convex surface. The largest...knowledge, is in the imperial cabinet of Vienna ; it is nearly as large as a man's fist, and weighs 17 ounces, but contains numerous fissures, and is not...
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A system of mineralogy: comprising the most recent discoveries: including ...

James Dwight Dana - 1854 - 533 pages
...precious opal, when large, and exhibiting its peculiar play of colors in perfection, is a gem of high value. It is cut with a convex surface. The largest...knowledge, is in the imperial cabinet of Vienna ; it is nearly as large as a man's fist, and weighs 17 ounces, but contains numerous fissures, and is not...
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Manual Of Mineralogy

James D. Dana, A.M. - 1855
...delicate tints. Composition, silica 90, water 10, (Klaproth.) This variety forms a gem of rare beauty. It is cut with a convex surface. The largest mass...knowledge is in the imperial cabinet of Vienna ; it weighs 17 ounces, and is nearly as large as a man's fist, but contains numerous fissures and is not...
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Manual of Mineralogy

James Dwight Dana - 1855 - 432 pages
...delicate tints. Composition, silica 90, water 10, (Klaproth.) This variety forms a gem of rare beauty. It is cut with a convex surface. The largest mass...knowledge is in the imperial cabinet of Vienna ; it weighs 17 ounces, and is nearly as large as a man's fist, but contains numerous fissures and is not...
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MANUAL OF MINERALOGY (1857)

JAMES D. DANA, A.M. - 1857
...delicate tints. Composition) silica 90, water 10, (Klaproth.) This variety forms a gem of rare beauty. It is cut with a convex surface. The largest mass...knowledge is in the imperial cabinet of Vienna ; it weighs 17 ounces, and is nearly as large as a man's fist, but contains numerous fissures and is not...
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Handbook to the industrial department of the International exhibition, 1862

Robert Hunt - 1862
...The precious opal, when large and exhibiting its peculiar play, of colours, is a gem of high value. The largest mass of which we have any knowledge is in the Imperial Cabinet of Vienna; it is nearly as large as a man's fist, and weighs 17 ounces. This stone was used as a gem by the Greeks...
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Manual of Mineralogy, Including Observations on Mines, Rocks, Reduction of ...

James Dwight Dana - 1864 - 456 pages
...delicate tints. Composition, silica 90, water 10, (Klaproth.) This variety forms a gem of rare beauty. It is cut with a convex surface. The largest mass...knowledge is in the imperial cabinet of Vienna ; it weighs 17 ounces, and is nearly as large as a man's fist, but contains numerous fissures and is not...
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