Name(s) _________________________________
______ ___________________________
Date _______________________________
ES Per ______
Teacher ____________
INTRODUCTION:
What are some OBSERVABLE characteristics that igneous rocks exhibit?
1) they may contain intergrown crystals seen with the naked eye (slow
cooling)
2) they may be glassy (very fast cooling)
3) they may contain gas holes (vesicular texture)
What are some OBSERVABLE characteristics that sed rocks exhibit?
1) They are composed of cemented sediments – look for clay, silt, sand,
and pebbles in mineral cement
2) They are deposited in layers, and this layering is visible (Stratification)
3) They contain fossils
4) They are bioclastic (cemented shells)
What is the observable characteristic that certain metamorphic rocks (the
ones you need to know) exhibit?
1) They are foliated (either mineral alignment or banding)
2) They may show distorted structure
3) They may have visible platy mica crystals (schistose texture)
ROCK ID PROCEDURE:
1) Select a rock sample from bin (1 at a time)
2) Find the number written on the rock. Make sure you place your answers
in the appropriate row on the ID sheet.
3) Observe the characteristics of the rock. See above.
4) Determine whether the rock is igneous, sedimentary, or metamorphic.
5) Record your answers on the rock ID sheet.
Directions: When you are done with the rock ID (check with your teacher),
answer these questions.
1) What name is applied to a coarse-grained, felsic igneous rock?
_______________________________
2) What rock has the same composition as granite, but smaller crystals?
________________________________
3) Name a coarse grained, dark colored igneous rock.
_____________________________________
4) Describe VESICULAR texture.
________________________________________________________________________________________
________________________________________________________________________________________
5) There are 2 rocks in your Igneous rocks chart that have an intermediate
composition only – meaning they are neither felsic nor mafic. Name those
rox.
_____________________________________ and __________________________________
6) How do the 2 kinds of rocks in question 5 differ from one another?
________________________________________________________________________________________
________________________________________________________________________________________
7) With respect to Earth’s surface, where do extrusive rocks cool and
crystallize (that is, where do they solidify)?
___________________________________________________________________________________________
8) What is name of the texture given to igneous rocks that contain NO crystals
(non-crystalline)?
_______________________________________
9) What are two characteristics that gabbro and basalt have in common?
a. _____________________________________________________________________________
b. ____________________________________________________________________________
10) What observable properties does gabbro exhibit that would be indicative
of its environment of formation?
___________________________________________________________________________________________
___________________________________________________________________________________________
11) What is the percentage of plagioclase in a typical granite? _________________
12) List the FOUR minerals usually found in basalt (use the middle of the box)
and then write the percentages of each.
BASALT COMPOSITION
MINERAL NAME
PERCENTAGE (%)
1
2
3
4
13) What TWO minerals tend to be found in the greatest variety of igneous
rocks? That is…which ones are the most common?
_______________________________________ and _____________________________________
14)
What igneous rock is generally composed of just ONE mineral?
______________________________________________________
15)
What coarse grained igneous rock is similar in composition to basalt?
______________________________________________________
16)
Unlike other kinds of rocks, igneous rocks form from what processes?
________________________________________________________________________________________
_______________________________________________________________________________________
17)
What is coal made from?
________________________________________________________________________________________
18)
What clastic rock is composed of the smallest grains of sediment?
_______________________________________________________________________________________
19)
Draw the pattern (the map symbol) used to represent limestone.
20)
What rock is composed of compacted / compressed clay?
_______________________________________________________________________________________
21)
A) How are breccia and conglomerate similar?
B) How are they different?
A) SIMILAR
___________________________________________________________________________________________
___________________________________________________________________________________________
B) DIFFERENT
___________________________________________________________________________________________
___________________________________________________________________________________________
22) What is the largest diameter of rock fragment generally found in
siltstone? Please make sure your answer is a DIAMETER, not a sediment
name.
_______________________________________________________________________________________
23)
What common sed rock is composed mostly of the mineral calcite?
_______________________________________________________________
24)
What THREE minerals dominate all of the CLASTIC sedimentary rocks?
________________________________________________________________________________________
25) If a rock is made of cemented sediment grains mostly about 1cm across,
what kind of rock is it?
______________________________________________________________________________
26)
Although Earth is mostly igneous rock, most of the bedrock we see at the
surface is sedimentary. Why?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
27)
How do metamorphic rocks form?
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
28) What are the TWO conditions needed to change a pre-existing rock into a
metamorphic rock?
________________________________ and/or ________________________________
29)
Name the two types of metamorphism.
____________________________________ and ______________________________________
30) What kind of metamorphism occurs next to an igneous intrusion of
molten magma?
_________________________________________________________________________________
31) What process is involved in the formation of all igneous rocks, but not in
the formation of metamorphic rocks?
_____________________________________________________________________________________
32) In what parts of NYS are metamorphic rocks most common?
(ESRT page 2 & 3)
________________________________________________________________________
33)
Which foliated metamorphic rock has the smallest grain size?
___________________________________________________
34)
What sedimentary rock can change into marble?
_______________________________________________________
35) As shown in the Meta Rocks chart (under Composition), which mineral
requires the most heat and pressure to form? Therefore, this mineral is only
seen in gneiss or high grade schist.
_____________________________________
36)
NAME the metamorphic rock that exhibits BANDED texture.
___________________________________
37) NAME the ONE metamorphic rock is formed exclusively by contact
metamorphism.
___________________________
38) Phyllite and Schist are two foliated meta rox. What distinguishable
characteristic could you observe to tell them apart?
___________________________________________________________________________
Names ______________________________________________________________
ROCK ID LAB
ID SHEET
Sample
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
Observable Characteristics
Rock type