420

DESCRIPTIVE MINERALOGY.

spar, and iron pyrites. It yields antimony of so inferior quality, that manufacturerscannot use it. It was first recognized and analyzed by Berth ier. Berthier has latelydescribed two other ores of antimony, (Memoires par Berthier, ii. ’273,) which havethe following characters.

The first has a fibrous texture, cross fracture granular, and almost dull. The coloris grayish blue, but less blue and having less lustre than gray antimony. It containedGangue 6 0, Sesquisulphuret of antimony 33'7, and Sulphuret of Iron 6'3. It occursin the mine of Martouret, near Chazelle.

The other has an iron-gray color, and a granular and fibrous structure. It containedQuartz 7, Sesquisulphuret of Antimony 75, Sulphuret of Iron 18. It is found atAglar, in the department of La Creuse . These, however, may possibly be varietiesof one another.

ZINKENITE. Lycites Zinkent.

G. Hose. PoggendorPs Annalen, VII. Brewster’s Journal, VI. IT.

514. Primary form : a hexagonal prism. Secondary form :the primary terminated by a low hexagonal pyramid. P : e=102°42'. Lateral faces longitudinally striated. G. Rose found in someinstances, the interfacial angle M : M equal to 120° 39', and henceconjectures, that the primary is a rhombic prism of this angle, andthat the observed crystals are compound forms similar to fig. 3 or6, PI. IV. The crystals are usually in groups, sometimes formingfibrous and massive varieties. Cleavage not observable.

H.=3—3o. G.=5-303. Lustre metallic. Streak and Color

steel-gray. Opaque. Fracture uneven.

It contains, according to H. Rose, (Poggendorf’s Annalen, viii. 99,) Sulphur 22-58,Lead 31-S4, Copper 012, Antimony +4'39=99 ’23. Heated alone on charcoal it de-crepitates briskly, and fuses as readily as gray antimony, affording small metallicglobules, which are soon volatilized, and the charcoal is covered with a white coal-ing of oxvd of lead. With carbonate of soda it yields globules of metallic lead.

Oes. it occurs in the antimony mine of Wolfsberg, in the Hartz. Its groups ofcolumnar crystals occur on a massive variety of the same species in quartz. Thesecrystals sometimes exceed half an inch in length, and have a breadth of two or threelines; but frequently they are extremely thin and form fibrous masses. It was namedin compliment to Mr. Zinken, the director of the Anhalt mines, by Dr. G. Rose, towhom we are indebted for the first description of it.

It much resembles gray antimony and Bournonite, but maybe distinguished by itssuperior hardness and specific gravity.

JAMESONITE. Lycites acrotomus.

Axotomous Antimony Glance,

515. Primary form : a right rhombic prism; M : M=101° 20',and 7S° 40'. Cleavage highly perfect parallel with P. Imperfectcrystallizations: structure columnar, particles delicate, straight,and parallel or divergent.

II.=2—2’5. G.=5-5—5-8 : 5-564, Haidinger. Lustre metallic.

Streak and Color steel-gray. Opaque. Sectile.