PART I

CLASSIFIED TABLE OF THE ROCKS.

Order No. I.—INGENITE ROCKS. (Divided into Classes, Groups, Subgroups, and Varieties.) Class I.-GRANITIC ROCKS.

Group A.-INTRUSIVE GRANITE (Highly siliceous granite). Subgroup A. Pyritous intrusive granite.

Group B.

Var. a. Beresyte.

B. Albitic granite.

C. Schorlaceous granite.

D. Granityte.

E. Felsitic granite.

F. Greissen, or quartzitic granite.
G. Porphyritic intrusive granite.

H. Pegmatyte.

Var. a. Graphic granite.

b. Blumen granite.

c. Plumose granite.

GRANITE FOR THE MOST PART NON-INTRUSIVE (Basic or oligoclase granite).

Subgroup A. Hornblendic granite.

Var. a. Titanitic granite.
b. Chloritic granite.

c. Talcose granite.

d. Epidotic granite.

B. Graphitic granite.

C. Hematitic granite.

D. Pyritous oligoclase granite.
E. Porphyritic oligoclase granite.
F. Gneissoid granite.

Var. a. Nodular granite.

b. Lenticular granite.

Subgroup G. Intrusive oligoclase granite.
H. Granitic felstone.

Group C.-PROTOGENE.

Group D.-ELVANYTE, or QUARTZ PORPHYRY.
Subgroup A. Felsitic and felspathic elvanyte.

Var. a. Orthoclasic elvanyte.

b. Oligoclasic elvanyte.

c. Rappakivi elvanyte.

B. Quartzitic elvanyte.

C. Micaceous elvanyte.

D. Pyritous elvanyte.

E. Hornblendic elvanyte.

Var. a. Micaceous hornblendic elvanyte.

b. Chloritic.

c. Felspathic.

d. Pyritous.

F. Chloritic elvanyte.
G. Granular elvanyte.
H. Compact elvanyte.
I. Gneissoid elvanyte.
J. Granitoid elvanyte.
K. Pyronieride.

Class II.-PLUTONIC ROCKS.

Group E.-FELStone, or FelsYTE.

Subgroup 4. Petrosilex.

Var. a. Felstone glass.

b. Ribaned petrosilex.

B. Quartzitic felstone.

Var. a. Oligoclasic quartzitic felstone.

b. Micaceous.

c. Hornblendic.

d. Chloritic.

e. Pyritous.

f. Striped.
g. Variolitic.

D. Euryte.

Var. a. Orthoclasic euryte.
b. Oligoclasic.

c. Micaceous.

d. Hornblendic.
e. Chloritic.

f. Quartzose.

g. Euryte porphyry. Amygdaloidal euryte.

i. Vesicular.

j. Compact.
k. Slab.

1. Cleaved.

E. Compact felstone.
F. Granular felstone.
G. Friable felstone.
H. Rubbly felstone.
I. Cleaved felstone.
J. Foliated felstone.

K. Granulyte.

L. Felstone porphyry.

Var. a. Amygdaloidal felstone. b. Vesicular felstone.

b. Felsitic.

c. Micaceous.

d. Hornblendic.

e. Syenyte gneissyte.
f. Chloritic.

g. Talcose.

h. Porphyritic.
i. Schistoid.

N. Schistoid felstone.

Group F.-WHINSTONE.
Subgroup A. Doleryte.

Var. a. White rock.
b. Aphanyte-doleryte.

B. Melaphyre.

Var. a. Eukryte.

b. Magnetic melaphyre.

B

Group G.-ROCKS DUE ΤΟ PSEUDOMORPHIC ACTION OR WEATHERING (Ingenite in part, derivate in part).

Subgroup 4. Ophyte.

Var. a. Ophihornblende rock.

B. Steatyte.