Description
Using the Key and the Rock Images Guide, identify the 21 rocks. On the Word file provided, list the identified rocks by number, and briefly explain how you identified each.
GEO101L_Lab4_Key – Rocks.pdf
GEO101L_Lab4_Rock_Images.pdf
GEO101L_Lab4_Answer sheet – Rocks.docx
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1. Igneous
Grain visibility
Texture/composition
Name
Properties
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
Scoria
Pumice
Black; glassy texture
Dark in color; porous
Light in color; porous
Fine grains
Basalt
Rhyolite
Dark gray-‐black; only very small crystals visible
Peachy-‐pink; only very small crystals visible
Grain size
Grain type
Grains are not Shells
Name
Breccia
Conglomerate
Fossiliferous Limestone
Coquina
Properties
Large angular grains
Large rounded grains
Fossils imbedded in considerable matrix
Fossils imbedded in very little matrix
Sandstone
Oolitic Limestone
Does not react to acid
Reacts to acid
Shale
Chert
Petrified Wood
Thinly bedded
Very smooth and angular
Characteristics of wood preserved
Grains are Obvious
Vesicular (porous)
Grains aren’t Obvious
2. Sedimentary
Grain visibility
Grains are Large
Grains are Shells
Grains are Visible
Grains are Not Large
Grains are not Visible
3. Metamorphic
Grain visibility
Banding
Banding Present
Name
Gneiss
Marble
Properties
Grains align in bands
Granular; will effervesce in acid
Banding Absent
Phyllite
Garnet schist
Fine, but visible grains
Large, 12-‐sided garnets imbedded in matrix
Slate
Dark colored; flat on top and bottom
Grains are Visible
Grains are not Visible
1
3: side view
2
3: top view
5
4
6: top view
6: side view
7: two varia5ons
8
9
11
10
12
13
14-‐side view
14-‐top view
16
15
17
18
18
19
20
21
21
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
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21.
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