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Group C—Bocks PARTLY Mechanically, Partly Chemically.

AND PARTLY ORGANICALLY FORMED.

Subgroup A. Laminated, or stratified coal.
Var. o. Carmel coal.

Subvar. a. Parrot coal.

b. Horn coal.

c. Torbanyte.

b. Splint coal.

c. Culm.

d. Bituminous shale.

e. Carbonaceous shale.

Subvar. a. Batt, or bass.

b. Dauks.

c. Kelve.

d. Pindy.

e. Slaty culm. B. Limestone.

Var. a. Compact limestone.

b. Crystalline limestone.

c. Marble.

d. Oolyte.

Subvar. a. Pisolyte.

b. Dolomitic oolyte.

e. Chalk.

Subvar. a. Indurated chalk.

b. Chalk rock.

c. Pisolitic chalk.

d. Glauconitic chalk.

e. Ferruginous chalk. /. Calcsinter.

Subvar. a. Travertine.

b. Stalactyte.

c. Stalagmyte.

d. Eockmeal.
g. Coral-reef limestone.

h. Brecciated limestone.
i. Limestone conglomerate,
j. Rubbly limestone.
k, Lithographyte.
I. Siliceous limestone,
m. Cherty.
n. Argillous.
o. Arenaceous.

Class III.—VOLCANIC ROCKS.

Group I.—Trachytic Group.

Subgroup A. Rhyolyte.

Var. a. Liparyte.
6. Perlyte.

c. Obsidian.

d. Pumice.

e. Phonolyte. B. Trachyte.

"V ar. a. Sanidine trachyte.

b. Drachenfels trachyte.

c. Domyte.

d. Andesyte.

e. Trachydoleryte.

/. Granular trachyte.
g. Compact trachyte.
h. Trachyte porphyry.
i. Trachyte lava.
j. Alumstone.

Group J.—Augitic Group.

Subgroup A. Augyte, or Doleryte.

Var. a. Nephelite augyte.

b. Haiiynophyre.

c. Allogovyte.

d. Common augyte.

e. Anamesyte.
/. Basalt.

g. Porphyritic basalt.
h. Amygdaloidal basalt..
i. Basalt lava.
j. Variolitic basalt.
B. Leucityte.

Var. a. Compact leucityte.
6. 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.
6. Pumiceous.

c. Phonolyte.

d. Pozzuolana.

B. Peperino.

Var. a. Augyte.
6. Leucityte.
c. Palagonyte.

C. Volcanic conglomerate.

Var. a. Volcanic breccia.

6. Volcanic agglomerate.

Class IV.—TRANSITION Or METAMORPHIC SEDIMENTARY ROCKS.

Group L.—Gneiss.

Subgroup A. Felspathic and felsitic gneiss.
Var. a. Orthoclase gneiss.
6. Oligoclase gneiss. .
e. Alpinyte.

d. Adularia gneiss.

B. Micaceous gneiss.

Var. a. Two-mica gneiss.
6. White mica gneiss.

e. Black mica gneiss.

G. Quartzitic gneiss.

D. Basic gneiss.

Var. a. Hornblendic gneiss.
6. Chloritic gneiss.

c. Talcose gneiss.

d. Protogene gneiss.

E. Iolitic gneiss.

F. Hematitic gneiss.

G. Graphitic gneiss.
H. Common gneiss.

Var. a. Compact gneiss.
6. Slate gneiss.

Var. c. Ribaned gneiss.
d. Fibrous gneiss.

Subgroup J". Oblique gneiss.

Var. a. Curled gneiss.
6. Nodular gneiss.
c. Conglomeritic gneiss.

/. Porphyritic gneiss.
K. Granitoid gneiss.

Group M.—Schist.

Subgroup A. Argillyte.

Var. a. Chiastolitic schist.

b. Phyllitic schist.

c. Carbonaceous schist.

d. Alum schist.

e. Spilyte.

/. Dolomitic schist.

g. Folded argillyte.

h. Contorted argillyte.

i. Fibrous argillyte.

B. Quartzyte.

Var. a. Itacolumyte.
6. Itabiryte.

c. Felsitic quartzyte.

d. Quartz rock.

e. Fibrous quartzyte.
/. Conglomeritic.

G. Felsyte schist.

Var. a. Micaceous.
6. Quartzose.

c. Pyritous.

d. Ribaned.

e. Mealy.

/. Gneissoid.

D. Mica schist.

Var. a. Two-mica schist.
6. Chloritic.

c. Talcose.

d. Garnetiferous.

e. Chiastolitic. /. Andalusitic. g. Amphibolic.

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

1. 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.
/. Talc schist.
g. Garnet.

h. Tourmaline.
i. Khsetizitic.

F. Metallic schists.

Var. a. Mico-iron schist.
8. Pyrite schist.
c. Pyrrhotite schist.

O. 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.

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