albite found at Mineral Hill, Pennsylvania, also exhibits the chatoyancy of moonstone.
Some of the trachytic lavas are said to abound with crystals of albite.
The felspar of the granulites is mostly orthoclase or cryptoperthite; microcline, oligoclase and albite are also common.
Small groups of black twin crystals have been lately discovered in the albite rock of Chesterfield in Massachusetts.
Zygadite, zig′a-dīt, n. a variety of albite found in thin twin crystals at Andreasberg, in the Harz Mountains.