27.—Diamond.
Occurs in crystals and irregular angular masses; cannot be scratched by any other mineral or the file; brilliant lustre; feels cold to the touch; when rubbed on the sleeve exhibits electricity for hours; retains the breath but a short time; often tinged yellow, red, or green; gravity 3.5.
Value.—Used for jewelry, lenses and for cutting glass.
Localities.—Found in gold-regions, in river-washings of sand and pebbles; usually with coarse gold, but deeper down. Rutherford, Cabarras, Franklin and Lincoln Counties, N. C.; Hall County, Ga.; Manchester, Va.; Cherokee Ravine, N. San Juan, French Canal, Forrest Hill, Placerville and Fiddletown, Cal.