Identifying Rocks and Minerals
A student found a rock in his backyard and wants to figure out whether it is a rock or a mineral. Which is NOT a question that we can ask to identify if the sample is a rock or mineral?
A) Is it all one color?
B) Could it have a fossil in it?
C) Is it smooth or rough?
D) How big is it?
D) how big is it?
True or False: Rocks are made up of minerals.
True
How is a metamorphic rock formed?
heat and pressure
Igneous rocks are classified by
silica content and crystal size
you will only find fossils in sedimentary rocks because....
heat and pressure or melting would destroy fossil evidence
You can compare minerals by looking at their?
D) all the above.
Which of the following best explains a hardness scale?
A) a scale that tests the hardness of a mineral by scratching other materials
B) a scale that tests the hardness of a rock by scratching other materials
C) a scale that tests the hardness of a mineral by being rubbed on other materials
D) a scale that tests the hardness of a rock by being rubbed on other materials
A) a scale that tests the hardness of a mineral by scratching other materials
Metamorphic rocks are broken into two subcategories
foliated and nonfoliated
Two subgroups of igneous rocks are
intrusive and extrusive
Subgroups of sedimentary rocks include:
clastic, chemical, organic
How are rocks and minerals identified?
A) Rocks are identified by their color, and minerals are identified by their size.
B) Rocks are identified by how they were formed, and minerals are identified by the structure of their crystals.
C) Rocks are identified by where they are found, and minerals are identified by how they were formed.
D) Rocks are identified by their shape, and minerals are identified by their color.
B) Rocks are identified by how they were formed, and minerals are identified by the structure of their crystals.
Pick the four characteristics of minerals that can be used to identify them.
A) shape
B) color
C) luster
D) texture
E) mass
F) size
G) hardness
H) weight
I) streak
B) color, C) luster, G) hardness, I) streak
Describe a foliated metamorphic rock
banded or stripped
Igneous rocks like granite have coarse crystals because
intrusive- cools slowly
sedimentary rocks will most likely be found near
water
Carson is looking at the difference between pyrite and quartz. He notices that pyrite reflects light and quartz looks dull and glassy. Which property is Carson testing?
A. mass test
B. luster test
C. color test
D. hardness test
B) luster test
A scientist wants to find out what type of mineral she has. What is the best way for her to find out?
A) She could look at the color, hardness, and luster.
B) She could look at the weight, hardness, and color.
C) She could look at the color, weight, and size.
D) She could look at the shape, size, and hardness.
A) She could look at the color, hardness, and luster
Where are metamorphic rocks formed?
deep underground
Igneous rocks are most likely found
near volcanoes like hawaii
Explain how each subgroup is formed
clastic- WEDCC
chemical- dissolved minerals in water
organic- compressed nonliving things
When sediments get compacted and cemented it forms what type of rock?
A) sedimentary rock
B) metamorphic rock
C) igneous rock
A) sedimentary rock
A diamond is measured as a 10 on the Mohs hardness scale for minerals. What will happen when a diamond is scraped against a mineral with a lower hardness rating?
A) the diamond will chip
B) the diamond will increase in hardness
C) the diamond will scratch the other mineral
D) the diamond will lose hardness to the other mineral
C) the diamond will scratch the other mineral
Where does the heat and pressure for a rock to become metamorphic come from?
The rock layers above
Describe extrusive igneous rocks
fine grained (small grains)
What do clastic sedimentary rocks contain?
rock fragments