in natural history, called by our lapidaries aqua marina, is a pellucid gem of a bluish green colour, found in the East Indies and about the gold mines of Peru: We have also some from Silesia, but what are brought from thence are often coloured crystals than real beryls; and when they are genuine, they are greatly inferior both in hardness and lustre to the oriental and Peruvian kinds.

The beryl, like most other gems, is met with both in the pebble and columnar form, but in the latter most frequently. In the pebble form it usually appears of a roundish but flatted figure, and commonly full of small flat faces, irregularly disposed. In the columnar or crystalline form it always consists of hexangular columns, terminated by hexangular pyramids. It never receives any admixture of colour into it, nor loses the blue and green, but has its genuine tinge in the degrees from a very deep and dusky to the palest imaginable of the hue of sea-water.

The beryl, in its perfect state, approaches to the hardness of the granet, but it is often softer; and its size is that of a small tare to that of a pea, a horse-bean, or even a walnut. It may be counterfeited by reducing burnt copper to an impalpable powder, and melting it with crystalline glaas or calcined crystal, in the proportion of one dram to a pound of glaas.

BERYL-crystal, in natural history, a species of what Dr Hill calls ellipomacryblyla, or imperfect crystals, is of an extreme pure, clear, and equal texture, and scarce ever subject to the slightest films or blemishes. It is ever constant to the peculiarity of its figure, which is that of a long and slender column, remarkably tapering. ing towards the top, and very irregularly hexangular. It is of a very fine transparency, and naturally of a pale brown; and carries so evident marks of distinction from all brown crystals, that our lapidaries call it, by way of eminence, the beryl crystal, or simply the beryl.