444 DESCRIPTIONS OF ROCKS. 
Kersanton is a similar rock, from near Brest, and from Quimper in 
Brittany, where it is used for buildings. It contains no hornblende, 
and aficrds about 53 per cent. of silica. Both have been called mica- 
dioryte (Glimmer-Diorite), although not hornblendic rocks. (See page 
425.) 
2. Kinzigyte.—Granular-crystalline to compact and schis- 
tose ; consists of biotite, oligoclase, garnet, without quartz, 
and contains, as accessories, microcline, iolite, and fibro- 
lite. Affords in analyses about 44°5 per cent. of silica. 
From Kinzig, north part of Black Forest. 
II. CONTAINING NEPHELITE. 
1. Miascyte.—Granitoid to schistose, and consisting of 
microcline, massive nephelite (eleeolite), sodalite, biotite, 
along with some quartz, and often some zircon, pyrochlore, 
monazite and other minerals. A related nephelite rock oc- 
eurs on Pic Island, Lake Superior. Named by G. Rose, 
from Miask in the Ilmen Mountains, where it has a wide 
distribution. Metamorphic. 
2. Ditroyte—A coarse to fine-grained rock, consisting of 
microcline, nephelite (elzolite), and sodalite. From Ditro in 
Eastern Transylvania, where it is associated with syenyte 
and mica schist and les between these two rocks. 
3. Phonolyte. (Clinkstone.)—Compact ; of grayish, blue, 
and other shades of color ; more or less schistose or slaty in 
structure; tough, and usually clinking under the hammer, 
like metal, when struck, whence the name. G.=2-4—2°7. 
Consists of glassy feldspar (orthoclase or oligoclase), with 
nephelite and some hornblende. G. Jenzsch gives, for the 
composition of the Bohemian phonolyte, Sanidin (glassy or- 
thoclase) 53:55, nephelite 31°76, hornblende 9°34, sphene 3:67, 
pyrite 0:(04=98°36. Under treatment with acids the nephe- 
lite is dissolved out. Nosean and hatiynite occur in some 
phonolyte. Hruptive only. 

4. HORNBLENDE AND POTASH-FELDSPAR SERIES. 
In this series the hornblende is sometimes replaced by 
epidote, another anhydrous iron-bearing mineral, yielding 
on analysis little or no alkali ; microcline is often present 
as well as orthoclase. The species graduate into kinds con- 
sisting almost solely of hornblende. Biotite is often pres- 
ent as an accessory mineral, 
