Merguian Archipelago.—Pearls and shells similar to the Manillas.
Mexico and Panama.—Pearls fair; blacks, grays and fancy colors often fine.
Shells, medium size: nacre has greenish edge.
South Sea Islands.—Pearls usually fine.
Shells generally large, heavy and fine black edge m. of p.
Venezuela.—Pearls, good luster and color—many fine baroques.
Shells: small, beautifully iridescent, but valueless.
Pearls.
| Hardness, 3.5-4 | Sp. Gr., 1.59-1.62 |
Composition.