1. Igneous Grain visibility Texturecomposition Name Pro.docx

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1. The document provides a key to identify different types of igneous, sedimentary, and metamorphic rocks based on their grain visibility, texture, composition, and other properties. 2. Igneous rocks are identified based on grain visibility, texture, and composition. Sedimentary rocks are identified based on grain visibility, size, and type. Metamorphic rocks are identified based on grain visibility and banding. 3. The key is then used to identify 21 different rocks: Basalt, Breccia, Chert, Conglomerate, Coquina, Diorite, Fossiliferous Limestone, Garnet schist, Gneiss, Granite, Mar

Education

1.
Igneous Grain
visibility Texture/composition Name Properties
Grains
are
Obvious
Quartz
Present Granite
Large
grained;
peachy-‐pink
grains
of
orthoclase
and
the
transparent
grains
of
quartz
Quartz
Absent Diorite Similar
to
granite,
but
not
orthoclase
or

quartz
Glassy Obsidian Black;
glassy
texture
Vesicular
(porous) Scoria Dark
in
color;
porous
Grains
aren't
Obvious Pumice Light
in
color;
porous
Fine
grains Basalt Dark
gray-‐black;
only
very
small
crystals
visible
Rhyolite Peachy-‐pink;
only
very
small
crystals
visible
2.
Sedimentary
Grain

visibility Grain
size Grain
type Name Properties
Grains
are
not
Shells Breccia Large
angular
grains
Grains
are
Large Conglomerate Large
rounded
grains
Grains
are
Shells Fossiliferous
Limestone
Fossils
imbedded
in
considerable
matrix
Grains
are
Visible Coquina Fossils
imbedded
in
very
little
matrix

Grains
are
Not
Large Sandstone Does
not
react
to
acid
Oolitic
Limestone Reacts
to
acid
Shale Thinly
bedded
Grains
are
not
Visible Chert Very
smooth
and
angular
Petrified
Wood Characteristics
of
wood
preserved
3.
Metamorphic
Grain
visibility Banding Name Properties
Banding
Present Gneiss Grains

align
in
bands
Grains
are
Visible Marble Granular;
will
effervesce
in
acid
Banding
Absent Phyllite Fine,
but
visible
grains
Garnet
schist Large,
12-‐sided
garnets
imbedded
in
matrix
Grains
are
not
Visible Slate Dark
colored;
flat
on
top
and
bottom

Identify the following rocks using the Key provided. Place the
names with the appropriate number.
Basalt, Breccia, Chert, Conglomerate, Coquina, Diorite,
Fossiliferous Limestone, Garnet schist, Gneiss, Granite, Marble,
Obsidian, Oolitic Limestone, Petrified Wood, Phyllite, Pumice,
Rhyolite, Sandstone, Scoria, Shale, Slate
1.
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21.

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