MERCURIAL HORN-ORE. ^7 I, occurs very rarely massive, almost always in small ■sides, which are crystallised m the interior. The crystals are the following - 1. Cube. 2 Cube truncated on the edges. _ 3 Rectangular four-sided prism, acutely acuminated with four planes, set on the lateral edges. 4. Cube truncated on the angles. The^yltatTre always so minute, that it is with dif- icultv their forms can be determined Their externa surface is sometimes smooth, sometimes drusy, and with an adamantine lustre. The fracture is straight foliated, and also fine and small occurs in fine granular distinct concre- Tt'is faintly translucent, or only translucent on the ^IUoes not alter its colour in the streak. It is soft, approaching to very soft. It is sectile. It is easily frangible. Chemical Characters. It i. totally volatilised before the blowpipe, and emit. , garlic smell- It is said to be soluble ,n water, and^t sob,tie,. mixed with lime-water give, an orange-colou precipitate. Constituent