KINDS OF ROCKS. 453 
ish-white, tough rock, consisting of an alumina-Jime garnet. 
G.=3°'39-3°49. From St. Francis, Canada. The superior 
yellow novaculite or whetstone, of Vieil Salm, Belgium, has 
the constitution, according to A. Renard, of a manganesian 
garnet. Metamorphic. 
3. Eclogyte—Compact and tough. Consists of granular 
garnet and hornblende, with grass-green smaragdite. G.= 
3°2-3°5. A related rock consists of reddish or brownish- 
yellow garnet, and black or greenish-black hornblende, with 
often some magnetite. Metamorphic. ; 
4. Epidosyte.—Pale green to pistachio-grecn. Consists of 
epidote mixed with quartz. Metamorphic. 
5. Eulysyte.—FVine-granular, consisting of chrysolite with 
a diallage-like mineral and garnet. Forms a bed in gneiss 
near Tunaberg, Sweden. 
6. Chrysolyte, or Chrysolite-Rcck.— Yellowish to pale olive- 
green, granular; consisting almost wholly of chrysolite. 
G. =3-3'1; H.=5:5-6. Abundant in Macon County, N. 
Carolina; in part changed to serpentine. Metamorphic. — 
Dunyte is yellowish-green ; granular, and consists of chrysolite, with 
some chromite. From Mount Dun, New Zealand. Eruptive. 
7. Lherzolyte.—Greenish-gray ; crystalline granular. Con- 
sists of chrysolite, enstatite, whitish pyroxene, with chrome- 
spinel and sometimes garnet. From Lake Lherz, etc. Is 
it metamorphie ? 
8. Picryte.— Blackish-green to brownish-red ; crystailine- 
eranular. Consists of chrysolite, with augite sometimes in 
crystals. Graduates into chrysolitic doleryte. 
9. Limburgyte.— A semi-glassy rock, consisting of chryso- 
lite and augite, with some magnetite. It is occasionaily 
amyedaloidal. Affords on analysis 43 per cent. of silica. 
8. HYDROUS MAGNESIAN AND ALUMINOUS ROCKS. 
Contain one or more of the hydrous magnesian minerals, 
chlorite, tale, serpentine, or the related hydrous aluminous 
mineral, pyrophyllite. The fine-grained kinds are more or 
less greasy to the touch ; and some of them resemble the 
hydromica slates. 
1. Chlorite Schist.—Schistose ; color dark green to grayish- 
grsen and greenish-black ; but little, if any, greasy to the 
touch. Consists of chlorite, with usually some quartz and 
