298 PHYSIOGRAPHY. 



Kyanite Labradorite. 



4. The varieties of Kyanite occur in crystals, or massive, imbedded in 

 rocks of the primitive class, as gneiss and mica slate ; and are often at- 

 tended by Garnet and Staurotide. 



6. Crystals, and large cleavable varieties, are found at St. Gothard in 

 Switzerland, the Zillerthal in the Tyrol, the Saualpe in Carinthia, and 

 the Bacher mountain in Stiria. The variety JElhtstizite is chiefly known 

 from Pfitsch in the Tyrol. The Fibrolite has been brought from the 

 Carnatic and from China, where it was found in loose crystals, accompa- 

 nying'Corundum. 



Several very interesting localities of Kyanite are known in the United 

 States, the most important of which is that in Massachusetts, at Chester- 

 field, where it occurs in mica-slate, accompanied by Garnet. Nodular 

 masses of Quartz, one or two feet in thickness, are here occasionally pen- 

 etrated throughout with crystals, and cleavable masses of the present 

 species, often of a handsome blue color. Large rolled masses, sometimes 

 above a foot in diameter, of a similar variety, occur at Litchfield and 

 West Farms, (Conn.) containing also Corundum and massive Apatite. 

 The variety Fibrolite occurs in very distinct prisms, at Lancaster, 

 (Mass.) and at Bellows Falls, (Vt.) ; at both places in gneiss. A black 

 variety is found in North Carolina, in the soil, accompanied by crystals 

 ofRutile. 



6. Blue varieties of Kyanite are sometimes cut as gems. 



KYMATINE. 



Massive : composition columnar, individuals thin, and arranged 

 so as to produce an undulating structure : also impalpable. 



Lustre pearly. Color greenish-grey. Streak white. 



Rather brittle. Hardness = 2-0 ... 3-00. Sp. gr. = 2'923 . . . 

 2981. 

 Locality not mentioned. 



LABRADORITE. Polychromatic Feldspar. 

 PARTSCH. 



Primary form. Doubly oblique prism. P on M =94 

 30'. PonT = 119. MonT=U5. 



Secondary forms. These are analogous to those of Al- 

 bite, but they present less variety, and on account of their 

 rarity in general, have been but little investigated. 



