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 4. 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. Pyromeride.

Class II.-PLUTONIC ROCKS.

Group E.-FELSTONE, or FELSYTE.

Subgroup A. 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.

Subgroup C. Minette.

Var. a. Fraidronyte.

D. Euryte.

Var. a. Orthoclasic euryte.
b. Oligoclasic.

c. Micaceous.

d. Hornblendic.
e. Chloritic.

f. Quartzose.
g. Euryte porphyry.
h. 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.

M. Gneissyte.

Var. a. Quartzose gneissyte.

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 TO PSEUDOMORPHIC ACTION OR WEATHERING (Ingenite in part, derivate in part).

Subgroup A. Ophyte.

Var. a. Ophihornblende rock.

B. Steatyte.

Var. a. Felspathic steatyte.
b. Pyroxenic.

c. Amphibolic.

Subgroup C. Eklogyte.

D. Epidosyte.

E. Kaolin.

F. Fuller's earth.

G. Meerschaum.

H. Magnesyte.

Group H.-TUFF (Ingenite in part, derivate in part).

Subgroup A. Felstone tuff.
Var. a. Quartzose.

b. Calcareous.

c. Pyritous.
d. Cupriferous.
e. Hematitic.

B. Whinstone, or Basic tuff.
Var. a. Hornblendic.

b. Pyroxenic.

c. Chloritic.

d. Calcareous.
e. Pyritous.

f. Cupriferous.

g. Hematitic.

C. Calcareous tuff.

D. Arenaceous.

E. Argillous.

F. Hematitic.
G. Pyritous.
H. Cupriferous.
I. Steatitic.
J. Porphyritic.

K. Nodular.

Var. a. Concretionary tuff.
b. Spheroidal.

L. Shaly tuff.

Var. a. Flaggy.
b. Slaty.

M. Conglomeritic tuff.

Var. a. Brecciated tuff.

b. Plutonic agglomerate.

Group J.-AUGITIC GROUP.

Subgroup A. Augyte, or Doleryte.

Var. a. Nephelite augyte.

b.

Haüynophyre.

c. Allogovyte.

d. Common augyte.

e. Anamesyte.

f. Basalt.

g. Porphyritic basalt.
h. Amygdaloidal basalt.
i. Basalt lava.

j. Variolitic basalt.

Group K.-VOLCANIC TUFA AND PEPERINO (Ingenite in part,

derivate in part).