Description
Need Correction on this assignmentPlease look at the attach file. The correct order is on the first page. Just like minerals.
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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. pumice
2. diorite
3. slate
4. oolitic limestone
5. coquina
6. petrified wood
7. gneiss
8. conglomerate
9. rhyolite
10. chert
11. scoria
12. marble
13. breccia
14. shale
15. fossiliferous limestone
16. sandstone
17. granite
18. phyllite
19. garnet schist
20. basalt
21. obsidian
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.Pumice
It is light in color and porous. Thus, it matches first rock image.
2.Diorite
It is similar to granite and missing in quartz thus it is second image.
3.Phyllite rock
It is very fine grain but visible grain. It matches will all the properties of the Phyllite
rock.
4.Sandstone
It is most easy to recognize. As, it is made up of sand grains.
5.Coquina
Fossils are found in very little matrix.
6. Petrified wood
Most similar to wood so easily recognized.
7.Gneiss
Bands are found so it is seventh image.
8.Conglomerate
It has rounded grains.
9.Shale
Thinly bedded visible rocks.
10.Chert
It has two characteristics. Very smooth but angular at edges so it is 10th image.
11.Scoria
Close watching tells it is Scoria as it dark as well as porous.
12.Rhyolite
Pinkish color and small crystals able to recognize this.
13.Fossiliferous Limestone
Simply, it is most similar to limestone with fossils at its backdrop.
14.Slate
Dark and flat color make it number 14th.
15.Breccia
Large angular grains show it is a Breccia.
16.Oolitic Limestone
Formed with ooids, spherical grains.
17.Granite
Large grained and easily recognized as it is found around us.
18.Basalt
Dark black color and only small crustal is visible.
19.Garnet schist
Extremely huge size of rocks imbedded so can be recognized.
20.Dolomite
Sedimentary rock with grey color able to recognize this rock.
21.Obsidian
Black color and glass like structure helps us to recognize it.
Reference
http://geology.com/rocks/
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