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Var. c. Ribaned gneiss.

d. Fibrous gneiss. Subgroup I. Oblique gneiss. .

Var. a. Curled gneiss.

b. Nodular gneiss.

C. Conglomeritic gneiss.
J. Porphyritic gneiss.

K. Granitoid gneiss.
Group M.—SchIST.
Subgroup A. Argillyte.

Tar. a. Chiastolitic schist.

b. Phyllitic schist.
c. Carbonaceous schist.
d. Alum schist.
C. Spilyte.
f. Dolomitic schist.
g. Folded argillyte.
h. Contorted argillyte.

i. Fibrous argillyte.
B. Quartzyte.
Var. a. Itacolumyte.

b. Itabiryte.
c. Felsitic quartzyte.
d. Quartz rock.
e. Fibrous quartzyte.

f. Conglomeritic.
C. Felsyte schist.
Var. a. Micaceous.

b. Quartzose.
C. Pyritous.
d. Ribaned.
e. Mealy.

f. Gneissoid.
D. Mica schist.
Var. a. Two-mica schist.

b. Chloritic.
C. Talcose.
d. Garnetiferous.
e. Chiastolitic.
f. Andalusitic.
g. Amphibolic.

Var. h. Epidotic.

i. Quartzose.
j. Felsitic.
k. Calcareous.
1. Schorlaceous.
m. Pyritous.
n. Pyrrhotitic.
0. Hematitic.
p. Graphitic.
9. Fine.
7. Ribaned.
s. Fibrous.
t. Nummoid.
u. Wavy.
V. Frilled.
w. Curled.
3. Knotty.
y. Nodular.

%. Gneissoid. Subgroup E. Basic schist.

· Var. a. Hornblende schist.

b. Actinolite.
C. Chlorite.
d. Chloritoid.
e. Potstone.
f. Talc schist.
g. Garnet.
h. Tourmaline.

i. Rhætizitic.
F. Metallic schists.
Var. a. Mico-iron schist.

b. Pyrite schist.

C. Pyrrhotite schist.
G. Burnt shale.

Var. a. Burnt clay.

b. Rock slag.

C. Porcelanyte.
H. Minerals forming rock masses (see page 22).
Var. a. Quartz.

b. Corundum.
C. Apatite.
d. Magnesite.

Var. e. Orthoclase.

f. Pistacite.
g. Pycnite.
ħ. Lepidolite.
i. Lievrite.
2. Magnetite.
K. Anthracite.

I. Graphite.
m. Eisenkiesel.

n. Garnet-rock. Group N.-SLATE. [See Order II., Class I., Group A, Sub

group B, Variety d.) Group 0.-CALCAREOUS Rocks. Subgroup A. Schistose limestone.

Var. a. Cipollino.

b. Calciphyre.
C. Hemitrene.
d. Felsitic limestone.
e. Statuary marble.

f. Granular schistose limestone. Group P.-PSEUDOMORPH CALCAREOUS Rocks. Subgroup A. Schistose dolomyte.

Var. a. Micaceous dolomyte.

b. Pyritous.
C. Saccharoid.

d. Granular.
B. Ophyte.
Var. a. Ophidolonyte.

b. Ophimagnesyte.
c. Ophicalcyte.

d. Ophyte schist.
C. Steatyte.
Var. a. Felsitic steatyte.

b. Hornblendic.
c. Pyroxenic.
d. Micaceous.
6. Steatyte schist.
f. Pyrallolyte.

g. Onkosin.
D. Magnesyte.
E. Smaragdite schist.

Order No. II.—DERIVATE ROCKS. (Divided into Classes, Groups, Subgroups, Varieties, and

Subvarieties.)

Class I.-SUBAQUEOUS ROCKS.

Group A.-ROCKS FOR THE MOST PART MECHANICALLY FORMED.
Subgroup A. Arenaceous rocks.

Var. a. Sand, gravel, and shingle.
b. Conglomerate.
Subvar. a. Calcareous.

b. Hematitic.
C. Cupriferous.
d. Pyritous.
e. Plumbeous.
f. Shale conglomerate.

g. Slate conglomerate.
c. Breccia.
Subvar. a. Calcareous.

b. Hematitic.

c. Cupriferous. • d. Pyritous.

e. Shale breccia.
d. Sandstone and grit.
Subvar. a. Calcareous.

b. Argillous.
C. Felspathic.
d. Micaceous.
e. Hematitic.
f. Cupriferous.
g. Pyritous.
h. Tuffose.
i. Pebbly.
j. Cleaved.
. Oblique.
1. Concretionary.
m. Spheroidal.
n. Nodular.
0. Lenticular.
p. Friable.

Var. e. Flagstone.
Subvar. a. Arenaceous.

b. Argillous.

C. Slabstone.
Subgroup B. Argillous or Argillaceous rocks.

Var. a. Clay, loam, mud, and silt.
Subvar. a. Kaolin.

b. Potter's clay.
c. Brick clay.
d. Fire clay.
e. Clunch.
f. Claystone.
g. Clayrock.
h. Lateryte.
i. Fuller's earth.
j. Bituminous clay.
k. Saliferous clay.

1. Variegated clay.
m. Hematitic clay.
n. Ferruginous clay.

0. Book clay.
b. Marl.
Subvar. a. Calcareous.

b. Dolomitic.
C. Argillous.
d. Arenaceous.
e. Micaceous.
f. Oil-slate.
g. Glauconitic.
h. Gypseous.
i. Shell marl.
j. Mealy marl.
k. Marl-stone.
1. Tutenic marl.

m. Book marl.
C. Shale.
Subvar. a. Calcareous.

b. Arenaceous.
c. Micaceous.
d. Bituminous.
e. Carbonaceous.
f. Hematitic.
g. Cupriferous.

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