63.—Silver Glance.
Occurs in small lumps, plates and threads; color dark gray; cuts like lead; melts in a candle giving off sulphur fumes; gravity 7.
Value.—The most important ore of silver, containing eighty-seven per cent.
Localities.—May be found almost everywhere, except in the coal regions; associated with other ores, quartz, limestone, baryta, etc. Most abundant where mineral veins cross one another. Comstock Lode, Gold Hill, Reese River, Cortez District and Silver-Sprout Vein, Nev.; Clear Creek County, Nev.