Ruthenium,—of a gray color, very hard and brittle; extracted from the ores of platinum, $2,400.
Niobium,—previously named columbium, first discovered in an ore found at New London, Conn., $2,300.
Rhodium,—of a white color and metallic lustre, and extremely hard and brittle. It requires the strongest heat that can be produced by a wind furnace for its fusion, $2,200.
Barium,—the metallic base of baryta, $1,800.
Palladium,—a metal discovered in 1803, and found in very small grains, of a steel-gray color and fibrous structure, $1,400.
Osmium,—a brittle, gray-colored metal, found with platinum, the most infusible of known metals, $1,300.
Iridium,—found native as an alloy, with osmium, in lead-gray scales, $1,000.
392. Which is the “Granite City”?
Aberdeen, Scotland, is so called, because the material employed in its buildings consists chiefly of light gray native granite. This granite has been quarried near this city for over three hundred years.
393. Where is the “Gate of Tears”?