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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.

[blocks in formation]

Var. h. Epidotic.
i. Quartzose.
j. Felsitic.

k. Calcareous.
7. Schorlaceous.
m. Pyritous.

n. Pyrrhotitic.
o. Hematitic.
p. Graphitic.
q. Fine.

r. Ribaned.

s. Fibrous.

t. Nummoid.

u. Wavy.

v. Frilled.

w. Curled.
x. Knotty.
y. Nodular.
2. 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.
h. Lepidolite.
i. Lievrite.
j. Magnetite.
k. Anthracite.
7. Graphite.
m. Eisenkiesel.

n. Garnet-rock.

Group N.-SLATE. [See Order II., Class I., Group A, Subgroup B, Variety d.]

Group O.-CALCAREOUS ROCKS.

Subgroup 4. 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. Ophyte.

b. Pyritous.

c. Saccharoid.
d. Granular.

Var. a. Ophidolomyte.
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 4. Arenaceous rocks.

Var. a. Sand, gravel, and shingle.

b. Conglomerate.

Subvar. a. Calcareous.

[blocks in formation]
[blocks in formation]

Subgroup B. Argillous or Argillaceous rocks.
Var. a. Clay, loam, mud, and silt.

[blocks in formation]
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