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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.
ħ. Amygdaloidal euryte,
i. Vesicular.
j. Compact.
k. Slab.

l. 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.

6. Magnetic melaphyre.

Var. c. Micaceous.

d. Porphyritic.
e. Amygdaloidal.
f. Vesicular.

g. Variolitic. Subgronp C. Pyroxenyte.

D. Diabase.
Var. a. Pyroxenic diabase.

b. Uralitic.
e. Labradoritic.
d. Oligoclasic.
e. Magnetic.
f. Kersantyte.
g. Calcareous diabase.
ħ. Porphyritic.
3. Amygdaloidal.
į. Vesicular.
K. Variolitic.

l. Aphanyte-diabase.
E. Gabbro.
Var. a. Euphotide.

b. Noryte.

c. Hyperyte.
F. Dioryte.
Var. a. Ampbibolyte.

b. Aphanyte-dioryte.
c. Kersanton.

d. Napoleonyte.
G. Syenyte.
Var. a. Quartzose syenyte.

b. Titanitic.
H. Hornblende rock.
Var. a. Actinolite rock.

b. Tremolite rock.
C. Hyperyte.
d. Dioryte.
e. Syenyte.
é. Felso-syenyte.

f. Mico-hornblende rock. Group G.-ROCKS DUE TO PSEUDOMORPHIC ACTION OR

WEATHERING (Ingenite in part, derivate in part). roup 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.

Class III.-VOLCANIC ROCKS.

Group I.—TRACHYTIC GROUP.
Subgroup A. Rhyolyte.

Var. a. Liparyte.

b. Perlyte.
c. Obsidian.
d. Pumice.

e. Phonolyte.
B. Trachyte.
Var. a. Sanidine trachyte.

b. Drachenfels trachyte.
C. Domyte.
d. Andesyte.
e. Trachydoleryte.
f. Granular trachyte.
g. Compact trachyte.
h. Trachyte porphyry.
i. Trachyte lava.

9. Alumstone.
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.
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).

Subgroup A. Tufa.

Var. a. Trachyte.

b. Pumiceous.
C. Phonolyte.

d. Pozzuolana.
B. Peperino.
Var. a. Augyte.

b. Leucityte.

C. Palagonyte.
C. Volcanic conglomerate.
Var. a. Volcanic breccia.

b. Volcanic agglomerate.

Class IV.—TRANSITION OR METAMORPHIC

SEDIMENTARY ROCKS.

Group L.—GNEISS.
Subgroup A. 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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