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[blocks in formation]

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 4. Doleryte.

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

B. Melaphyre.

Var. a. Eukryte.
b. Magnetic me

B

[blocks in formation]

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

[blocks in formation]

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.

[blocks in formation]

Group J.-AUGITIC GROUP.

Subgroup A. Augyte, or Doleryte.

Var. a. Nephelite augyte.

b. Hauynophyre.

c. Allogovyte.

d. Common augyte.

e. Anamesyte.

f. Basalt.

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

j. Variolitic basalt.

B. Leucityte.

Var. a. Compact leucityte.
b. Leucitophyre.

c. Amygdaloidal leucityte.
d. Leucityte lava.

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

derivate in part).

[blocks in formation]

Subgroup 4. Felspathic and felsitic gneiss.

Var. a. Orthoclase gneiss.

b. Oligoclase gneiss.

e. Alpinyte.

d. Adularia gneiss.

B. Micaceous gneiss.

Var. a. Two-mica gneiss.
b. White mica gneiss.
c. Black mica gneiss.

C. Quartzitic gneiss.

D. Basic gneiss.

Var. a. Hornblendic gneiss.
b. Chloritic gneiss.
c. Talcose gneiss.
d. Protogene gneiss.

E. Iolitic gneiss.
F. Hematitic gneiss.
G. Graphitic gneiss.

H. Common gneiss.

Var. a. Compact gneiss.
b. Slate gneiss.

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