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ZEOLITE COMMUNE.

ZINCITE.

Name. From iw, to loil, because of their | Santander, Spain; of a pure white, and S.G. general character of intumescing when 2.25.

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ZEOLITHE NACRÉE,

Ladnelherie.

See FOLIATED STILBITE.

ZEOLITHE RAYONNÉE, Brochant. See STILBITE.

ZEUXITE, Thomson. The name given by Dr. Thomson to a variety of Iron-Tourmaline met with at Huel Unity, in Cornwall, in small translucent, acicular crystals, of a greenish-black colour. The crystals, apparently rectangular prisms, were much interlaced and collected into fibrous masses. H. 4 to 5. S.G. 3 to 3.1.

BB alone infusible; with borax, forms a dark-brown glass.

Name. From us, a connexion; because of its occurrence at the United Mines. ZEYLANITE, or CEYLANITE, Werner. A variety of PLEONASTE. See ZEILANITE.

ZIANITE, Werner. See KYANITE. ZIEGELERZ, Werner. ZIEGUELINE, Beudant. Earthy Red Oxide of Copper. See

TILE ORE.

ZINC is stated by G. Ulrich to have been found in a metallic state near Victoria, in Australia. According to Becker it occurs, also, in the gold washings of the Mitta

River.

ZINC-BLENDE, Jameson. See BLENDE. ZINC BLOOM, Smithson, Dana. Occurs in reniform earthy masses, and incrustations, and is probably a result of the decomposition of Calamine. Colour white, greyish, or yellowish. Opaque. Lustre dull. Streak shining. H. 2 to 2.5. S.G. 3.58 to 6.

Comp. Zn3 C+ 3H (Smithson), or Zn C+ Zn2 H (Rammelsberg). Analysis, by Smithson:

Oxide of zinc Carbonic acid Water

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71.4

13.5

15.1

100.0

Localities. Bleiberg and Raibel in Carinthia; associated with ores of zinc and lead.

ZINC-CARBONATÉ, Haüy, Dufrénoy. See

CALAMINE.

ZINCFAHLERZ. See KUPFERBLENDE. ZINC-GLANCE. See SILICEOUS CALAMINE or SMITHSONITE.

ZINC HYDRATE CUPRIFÈRE, Levy. See TYROLITE.

ZINC HYDRO-CARBONATÉ, Dufrénoy. See ZINCITE.

ZINC-IRON SPAR. The name proposed by Monheim for the dark-green varieties of Zinc-spar (Calamine), and also to those which turn brown by oxidation of the iron.

ZINC-LEAD-SPAR, Karsten. Carbonate of lead, containing an admixture of 7 per cent. of carbonate of zinc.

ZINC OXIDE. See ZINCITE.
ZINC OXIDÉ FERRIFÈRE, Haüy.
FRANKLINITE.

See

ZINC OXIDE ROUGE, Dufrénoy. See SPAR

TALITE.

ZINC OXIDE SILICIFÈRE, Haüy. See SMITHSONITE.

ZINC OXYD, v. Leonhard. See ZINCITE. ZINC SPAR. See CALAMINE.

ZINC SULFATE, Hauy. See GOSLARITE. ZINC SULFURE, Hauy. See BLENDE. ZINC VITRIOL, Kirwan, Jameson. See GOSLARITE.

ZINCITE, Haidinger, Dana, Nicol. ZINCONISE, Beudant. Hexagonal; with a perfect basal cleavage. Generally occurs disseminated in crystalline grains or coarse particles, and aggregates. Structure granular, also foliated. Colour blood-, or hyacinth-red, also inclining to yellow. Translucent at the Lustre subadamantine. Streak edges. orange-yellow. Brittle. Fracture subconchoidal. H. 4 to 4.5. S.G. 4:32 to 5-53.

Comp. Oxide of zinc, or Zn-zinc 80.26, oxygen 19.74=100.

According to Leopold Gmelin, Zincite is a mixture of 88 parts of zinc-oxide and 12 parts protoperoxide of manganese.

Analysis, from Franklin, by W. P. Blake. S.G. 5.684 (at 60° F.):

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ZINCKENITE.

Dissolves without effervescence in nitric acid.

Localities. New Jersey, at Stirling Hill, Sussex co., with Franklinite and Calc Spar; also at Franklin. "At the zinc-smelting works at Filisur, in the Grisons, there are found sublimed in the upper part of the crucibles, in which the zinc is melted, amber-coloured, transparent, hard, shining, six-sided prisms, which have a density of 6.0, yield a white powder, becoming yellow when heated, and consist of zinc-oxide with a trace of sulphide."- (L. Gmelin, vol. v. p. 10.)

ZINCKENITE, Nicol. See ZINKENITE.
ZINKARSENIAT, Otto Köttig. See Kör-

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BB decrepitates strongly. On charcoal melts as readily as Grey Antimony; small metallic globules are formed, which entirely volatilize, while the charcoal is covered with a white coating of oxide of lead. With carbonate of soda yields globules of metallic lead.

Locality. The antimony mine of Wolfsberg, near Stolberg, in the Harz.

Lithia Fluorine Magnesia Lime

Soda

Phosphoric acid

ZIPPEITE, Dana, Greg & Lettsom. Occurs earthy and pulverulent. Amorphous. Opaque. Dull. Fracture earthy.

EE

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BB becomes orange-yellow when heated gently. In the reducing flame changes to green, but does not fuse.

Localities.- English. Cornwall: Callington; Carharrack; Withiel Iron-mine; Huel Edward; Huel Buller; near St. Michael's Mount, coating Mica, on a quartzose rock. Foreign. Joachimsthal, in Bohemia. Symphorien, in France. The felspar quarry, near Middletown, Connecticut, U.S.

Name. In honour of Zippe, Professor of Mineralogy in Prague.

ZIRCON, Werner, Dana, Phillips, Nicol, Brooke & Miller, Haüy, Hausmann, Greg & Lettsom. Pyramidal: primary form an obtuse octahedron, with a square base. Occurs in crystals bearing a remarkable resemblance to those of oxide of tin (Cassiterite) with which it is isomorphous: also in rounded grains. Colour red, brown, yellow, green or grey; rarely white. Transparent to opaque. Doubly refractive. Lustre more or less adamantine. Streak white. Fracture conchoidal and brilliant. H. 7.5. S.G. 4

to 4.75.

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BB loses colour but does not fuse. large quantity of borax, dissolves with difficulty, and forms a transparent glass; wiih a smaller quantity forms a turbid glass. Does not dissolve to any perceptible extent in microcosmic salt or carbonate of soda. Zircon may be fused with potash, lime, or oxide of lead.

Not decomposed by acids even by muriatic acid-hot oil of vitriol, however, acts slightly on it.

Localities.

- Fo

Scotch. Strontian, Argyleshire; fig. 472. Isle of Harris, fig. 473. Sutherlandshire. — Irish. Croghan Kinshela mountain, in the auriferous streams. reign. Kitiksut, in Greenland. Norway, along the Christianiafjord, between Stavärn and Hackedalen. Sweden. The Sau-Alp, in Carinthia. The Siebengebirge. Expailly, in Auvergne. Vicenza, in Italy. Vesuvius, in ejected blocks. Assuan, in Upper Egypt. Some stones of very fine colour and transparency," constituting veritable gems," have been obtained by Sir William E. Logan, in Canada; they occur in the crystalline limestone of the Laurentian series, at Grenville Township, Argenteuil co., C. E.

Name. From the Arabic word Zerk, signifying a precious stone.

Brit. Mus., Case 26.

846, 850 to 852. M.P. G. Horse-shoe Case, Nos. 845,

Zircon is divided into three varieties; 1st, the colourless or slightly smoky or Jargoon; 2nd, the bright red or Hyacinth; and 3rd, the greyish or, brownish, called Zirconite. See also ERDMANNITE and OSTRANITE. the same external characters, and in every Zircons with the same crystalline form, respect precisely identical with the Zircons of Somma (Vesuvius) have been recently obtained artificially by Mons. Henri SainteClaire Deville, by passing fluoride of silicium over Zirconia at a red heat. Mons. Deville believes that it may be inferred, with nearly absolute certainty, that the Zircon has been formed by igneous agency, from the small quantities of Fluor which are present in the metamorphic rocks in which it occurs.

ZIRCONITE. The name applied to the Comp. Silicate of zirconia, or Zr Si= greyish or reddish-brown and nearly opaque zirconia 66.23, silica 33·77=100.

varieties of Zircon.

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ZIRKON, Werner. See ZIRCON. ZOISIT, Karsten, Werner. ZOISITE, Phillips, Greg & Lettsom. A variety of LimeEpidote occurring in rhombic prisms which are usually deeply striated, and often columnar-massive. The crystals are seldom perfect, the obtuse lateral edges of the prisms being often rounded, and the terminations incomplete. Colour grey, yellowishgrey or brown. Translucent. Lustre pearly. H. 6 to 7. S.G. 3.28 to 3:35.

BB alone, fuses at the outer edges to a yellowish transparent glass, but finally to a vitreous scoria. With borax swells up and forms a pale yellow diaphanous glass which is colourless when cold.

Comp. Ca3 Si+3Äl Si.

Analysis, by Rummelsberg:

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Localities.

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- Scotch. Glenelg, Invernessshire. Irish. Holly Hill, near Strabane, co. Tyrone. Foreign. Bacher mountain, and Šau - Alp, in Carinthia. The Ural. Bayreuth, Conradsreuth; in Bavaria. Fernleite, in Salzburg. Sterzing, in the Tyrol. The Valais. Various parts of the United States, as Willsboro', Vermont; Montpelier, Chester and other places in Massachusetts; Milford, Connecticut; Pennsylvania, &c. Name. After the Austrian mineralogist, the Baron Von Zois.

Brit. Mus., Case 35.

This mineral was separated from Epidote, and named a distinct species by Brooke & Miller, on crystallographic grounds. Des Cloiseaux has, also, shown from the optical properties of Zoisite that it is distinct from

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Epidote, the former belonging to the oblique system, while the latter has the rhombic form.

ZÖLESTIN, Werner. See CELESTINE.

ZOOTINSALZ, Breithaupt. See NITRATINE. ZORGITE. The name applied by Brooke & Miller to the Tilkerodite of Haidinger, and the Raphanosmite of Von Kobell; i.e. to those varieties of Clausthalite in which a portion of the lead is replaced by cobalt or

copper.

ZUISANG. The Chinese name for pure and sky-blue varieties of Lapis Lazuli.

ZUNDERERZ. Tinder Ore (which see). ZURLITE, Ramondini. A variety of Mellilite. Occurs on Vesuvius, generally in large, distinct, rectangular, four-sided prisms, with their lateral edges occasionally replaced. The surface of the crystals is rough, and frequently covered with a white coating. Colour asparagus-green, inclining to grey. Opaque. Lustre resinous. Fracture conchoidal. H. about 6. S.G. 3.27.

BB infusible. With borax gives a black glass.

Dissolves with effervescence in nitric acid and the solution becomes yellow.

Name. After the Neapolitan minister, Signor Zurlo.

ZWIESELITE, Breithaupt, Dana, Nicol. ZWISELITE, Brooke & Miller, Haidinger. Occurs in crystalline masses, with an imperfect cleavage in three directions. Colour clove-brown. Translucent at the edges. Lustre greasy. Streak greyish-white. Fracture conchoidal or uneven. H. 5. S.G. 3.95 to 4.

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