ZIRKON. 



Localities. — Foreign. Miask, in the Ural. 

 Kitiksut, in Greenland. Frederiksvarn, in 

 Norway, in syenite. Scalpay, in the Isle of 

 Harris, one of the Hebrides. Buncombe co., 

 North Carolina. New York co. 



Fig. 474, Y I M I I 1 Fig. 475. 



Brit. Mas., Case 26. 



ZiRKON, Werner, See Zircon. 



ZoiSiT, Karsten, Werner. ZoiSlTE, Phil- 

 lips, Greg §• Lettsom. A variety of Lime- 

 Epidote occurring in rhombic prisms which 

 are usually deeply striated, and often co- 

 lumnar-massive. The crystals are seldom 

 perfect, the obtuse lateral edges of the 

 prisms being often rounded, and the termi- 

 nations incomplete. Colour grey, yellowish- 

 grey 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 colom-less when cold. 



Comp. Ca3Si + 3AlSi. 

 Analysis, by Rammelsberg ; 



Silica .... 



Alumina 



Peroxide of iron . 



Lime .... 

 3ia 



ZWIESELITE. 



419 



. 41-51 



. 28-90 

 . 3-98 

 . 24-78 

 . 0-58 



99-75 



Localities. — Scotch. Glenelg, Inverness- 

 shire. — Irish. Holly Hill, near Strabane, 

 CO. Tyrone. — Foreign. Bacher mountain, 

 and Sau - Alp, in Carinthia. The Ural. 

 Bayrenth, Conradsreuth ; in Bavaria. Fern- 

 leite, in Salzburg, Sterzing, in the TjtoI. 

 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 



Epidote, the former belonging to the oblique 

 system, while the latter has the rhombic 

 form, 



ZoLESTiN, Werner. See Celestine. 



ZooTiNSALZ, Breithaupt. See Nitratinb. 



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 Mel- 

 lilite. 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 con- 

 choidal, 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. 

 Zaviselite, Brooke §* Miller, Haidinger . 

 Occurs in crystalline masses, with an im- 

 perfect cleavage in three directions. Colour 

 clove-brown. Translucent at the edges. 

 Lustre greasy. Streak greyish-white. Frac- 

 ture conchoidal or uneven. H. 5, S.G. 3-95 

 to„4. 



Comj). Fe5p + FeF. 



Analysis, by Rammelsberg , 



Phosphoric acid . . 30-33 



Protoxide of iron . . 41-42 



Protoxide of manganese . 23-25 

 Fluorine .... 6-00 



101-00 



BB decrepitates, and finally fuses to a 

 bluish-black magnetic glass. 



Easily soluble in warm sulphuric acid, 

 affording traces of fluorine. 



Locality. Zwisel, near Bodenmais, 

 (whence "the name Zwiselite), in Bavaria, 

 in granite. 



Zwiselite has been shown by Kenngott 

 to be a variety of Triplite, with which it is 

 identical in crystalline form, and other 

 physical properties, and similar in chemical 

 composition. 



