Directions Step 1: On the data table below, enter the specimen number for each of the minerals of Mohs Hardness Scale, which you determined in the "Introduction and Mohs Hardness Scale" lab. Step 2: Go to this website: http://academic.brooklyn.cuny.edu/geology/leveson/core/graphics/hardsim/hard simбx.ht ml Step 3: Select one of the unknown minerals from "List #1" (on the website). You will see it show up under the yellow box in picture form. Step 4: Select a mineral from Mohs Hardness Scale from "List #2" (on the website). You will see it show up under the Yellow box in picture form. Remember that from the "Introduction and Mohs Hardness Scale" lab, the minerals of Mohs Hardness Scale have an asterisk (*) next to them. You also determined the names for each of those asterisked minerals in that lab. Step 5: Push the "Scratch" button under the pictures. Does the Mohs Hardness Scale Mineral scratch the unknown mineral? If it does, enter "yes" on the data table." If it doesn't, enter a "no" on the data table. However, if neither mineral gets scratched in the process, they are the same hardness, so write "equal" on the data table. Step 6: Repeat this process with the same mineral from "List 1" but this time, select a different Mohs Hardness Scale mineral from "List #2." Record the results of the hardness test (a yes, no, or equal) in the data table. Step 7: Determine between which two Mohs Hardness Scale minerals the hardness of the unknown specimen falls, or if it is equal in hardness to one of the Mohs Minerals. Remember, if neither the unknown mineral or the Mohs mineral gets scratched during the test, then they have the same hardness. Otherwise, it falls between two hardness values, and the difference can be split. For example, specimen #16 is scratched by #6* (calcite, which has a hardness of 3) and all harder minerals of Mohs Hardness Scale. However, it is not scratched by (and instead scratches) #12* (gypsum, which has a hardness of 2) and all softer Mohs minerals. Therefore, the hardness of specimen #16 is between a hardness of 2 and 3, resulting in a hardness of 2.5. Step 8: Repeat the above steps for each of the unknown minerals. Step 9: Answer the questions below about the hardness of these minerals. = 50 8 Minerals - Hardness of Unknown Minerals Note: you must do the "Introduction and Mohs Hardness Scale" lab before doing this lab since some of your results from that lab are needed to complete this one! For this lab, you will test the hardness of unknown minerals by interacting with a website developed by a geology professor, David J. Leveson, with photographs by Guillermo Rocha, both from Brooklyn College. This site discusses mineral properties and testing procedures and also provides an opportunity for you to practice testing minerals. Make sure to read all of the information provided on each specified webpage as you attempt to answer the questions. I recommend that you print this lab to keep track of your answers, and then use those to input your answers into our online class site so that you can then get credit for the laboratory exercise. Determine the Hardness of Unknown Minerals Using your knowledge of Mohs Hardness Scale, you will now determine a numerical value for the hardness of assigned unknown minerals (specimen #s 1, 2, 4, 5, 10, 11, 13, 14, 15, 16, 17, 19, 20 and 22). The hardness of any mineral can be determined by figuring out which two minerals the unknown mineral lies between on Mohs Hardness Scale. For example, imagine that an unknown mineral is scratched by quartz, but is not scratched by orthoclase. Instead, the unknown mineral scratches the orthoclase. Since quartz has a hardness of 7, and orthoclase has a hardness of 6, our unknown mineral would have a hardness of 6.5. It is also possible for a mineral to have a hardness exactly that of the hardness of one of the Mohs Minerals. In that case, they will not scratch each other, and the hardness of the unknown will be a whole number equal to that of the hardness of the Mohs mineral. Knowing the hardness of an unknown mineral is often useful in identifying it. For example, apatite and beryl are often very similar in appearance. However, they have very different hardness. Apatite has a hardness of 5, while beryl has a hardness of 7.5 to 8. Therefore, a simple hardness test can help distinguish them.

Directions Step 1: On the data table below, enter the specimen number for each of the minerals of Mohs Hardness Scale, which you determined in the "Introduction and Mohs Hardness Scale" lab. Step 2: Go to this website: http://academic.brooklyn.cuny.edu/geology/leveson/core/graphics/hardsim/hard simбx.ht ml Step 3: Select one of the unknown minerals from "List #1" (on the website). You will see it show up under the yellow box in picture form. Step 4: Select a mineral from Mohs Hardness Scale from "List #2" (on the website). You will see it show up under the Yellow box in picture form. Remember that from the "Introduction and Mohs Hardness Scale" lab, the minerals of Mohs Hardness Scale have an asterisk () next to them. You also determined the names for each of those asterisked minerals in that lab. Step 5: Push the "Scratch" button under the pictures. Does the Mohs Hardness Scale Mineral scratch the unknown mineral? If it does, enter "yes" on the data table." If it doesn't, enter a "no" on the data table. However, if neither mineral gets scratched in the process, they are the same hardness, so write "equal" on the data table. Step 6: Repeat this process with the same mineral from "List 1" but this time, select a different Mohs Hardness Scale mineral from "List #2." Record the results of the hardness test (a yes, no, or equal) in the data table. Step 7: Determine between which two Mohs Hardness Scale minerals the hardness of the unknown specimen falls, or if it is equal in hardness to one of the Mohs Minerals. Remember, if neither the unknown mineral or the Mohs mineral gets scratched during the test, then they have the same hardness. Otherwise, it falls between two hardness values, and the difference can be split. For example, specimen #16 is scratched by #6 (calcite, which has a hardness of 3) and all harder minerals of Mohs Hardness Scale. However, it is not scratched by (and instead scratches) #12* (gypsum, which has a hardness of 2) and all softer Mohs minerals. Therefore, the hardness of specimen #16 is between a hardness of 2 and 3, resulting in a hardness of 2.5. Step 8: Repeat the above steps for each of the unknown minerals. Step 9: Answer the questions below about the hardness of these minerals. = 50 8 Minerals - Hardness of Unknown Minerals Note: you must do the "Introduction and Mohs Hardness Scale" lab before doing this lab since some of your results from that lab are needed to complete this one! For this lab, you will test the hardness of unknown minerals by interacting with a website developed by a geology professor, David J. Leveson, with photographs by Guillermo Rocha, both from Brooklyn College. This site discusses mineral properties and testing procedures and also provides an opportunity for you to practice testing minerals. Make sure to read all of the information provided on each specified webpage as you attempt to answer the questions. I recommend that you print this lab to keep track of your answers, and then use those to input your answers into our online class site so that you can then get credit for the laboratory exercise. Determine the Hardness of Unknown Minerals Using your knowledge of Mohs Hardness Scale, you will now determine a numerical value for the hardness of assigned unknown minerals (specimen #s 1, 2, 4, 5, 10, 11, 13, 14, 15, 16, 17, 19, 20 and 22). The hardness of any mineral can be determined by figuring out which two minerals the unknown mineral lies between on Mohs Hardness Scale. For example, imagine that an unknown mineral is scratched by quartz, but is not scratched by orthoclase. Instead, the unknown mineral scratches the orthoclase. Since quartz has a hardness of 7, and orthoclase has a hardness of 6, our unknown mineral would have a hardness of 6.5. It is also possible for a mineral to have a hardness exactly that of the hardness of one of the Mohs Minerals. In that case, they will not scratch each other, and the hardness of the unknown will be a whole number equal to that of the hardness of the Mohs mineral. Knowing the hardness of an unknown mineral is often useful in identifying it. For example, apatite and beryl are often very similar in appearance. However, they have very different hardness. Apatite has a hardness of 5, while beryl has a hardness of 7.5 to 8. Therefore, a simple hardness test can help distinguish them.

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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Related questions

Question

Earth Science Lab: Mineral Hardness

Introduction to minerals and Mohs Hardness Scale

Interactive website exploration

Identify mineral vs. rock

Determine hardness of minerals using scratch test

Apply Mohs Hardness Scale to identify mineral hardness

Complete 25 multiple-choice questions

Save results for future use

Answer the following questions

Question 1 8 pts

What is the hardness of specimen #1?

Group of answer choices

2.5

7.5

Flag question: Question 2

Question 2 8 pts

What is the hardness of specimen #2?

Group of answer choices

5.5

3.5

Flag question: Question 3

Question 3 7 pts

What is the hardness of specimen #4?

Group of answer choices

4.5

7.5

Flag question: Question 4

Question 4 7 pts

What is the hardness of specimen #5?

Group of answer choices

2.5

5.5

Flag question: Question 5

Question 5 7 pts

What is the hardness of specimen #10?

Group of answer choices

4.5

2.5

Flag question: Question 6

Question 6 7 pts

What is the hardness of specimen #11?

Group of answer choices

4.5

6.5

Flag question: Question 7

Question 7 7 pts

What is the hardness of specimen #13?

Group of answer choices

6.5

2.5

Flag question: Question 8

Question 8 7 pts

What is the hardness of specimen #14?

Group of answer choices

2.5

3.5

Flag question: Question 9

Question 9 7 pts

What is the hardness of specimen #15?

Group of answer choices

3.5

7.5

Flag question: Question 10

Question 10 7 pts

What is the hardness of specimen #16?

Group of answer choices

2.5

6.5

Flag question: Question 11

Question 11 7 pts

What is the hardness of specimen #17?

Group of answer choices

6.5

4.5

Flag question: Question 12

Question 12 7 pts

What is the hardness of specimen #19?

Group of answer choices

1.5

6.5

Flag question: Question 13

Question 13 7 pts

What is the hardness of specimen #20?

Group of answer choices

5.5

4.5

Flag question: Question 14

Question 14 7 pts

What is the hardness of specimen #22?

Group of answer choices

6.5

8.5

Directions
Step 1: On the data table below, enter the specimen number for each of the minerals of
Mohs Hardness Scale, which you determined in the "Introduction and Mohs Hardness
Scale" lab.
Step 2: Go to this website:
http://academic.brooklyn.cuny.edu/geology/leveson/core/graphics/hardsim/hard simбx.ht
ml
Step 3: Select one of the unknown minerals from "List #1" (on the website). You will see
it show up under the yellow box in picture form.
Step 4: Select a mineral from Mohs Hardness Scale from "List #2" (on the website). You
will see it show up under the Yellow box in picture form. Remember that from the
"Introduction and Mohs Hardness Scale" lab, the minerals of Mohs Hardness Scale have
an asterisk (*) next to them. You also determined the names for each of those asterisked
minerals in that lab.
Step 5: Push the "Scratch" button under the pictures. Does the Mohs Hardness Scale
Mineral scratch the unknown mineral? If it does, enter "yes" on the data table." If it
doesn't, enter a "no" on the data table. However, if neither mineral gets scratched in the
process, they are the same hardness, so write "equal" on the data table.
Step 6: Repeat this process with the same mineral from "List 1" but this time, select a
different Mohs Hardness Scale mineral from "List #2." Record the results of the hardness
test (a yes, no, or equal) in the data table.
Step 7: Determine between which two Mohs Hardness Scale minerals the hardness of the
unknown specimen falls, or if it is equal in hardness to one of the Mohs Minerals.
Remember, if neither the unknown mineral or the Mohs mineral gets scratched during the
test, then they have the same hardness. Otherwise, it falls between two hardness values,
and the difference can be split. For example, specimen #16 is scratched by #6* (calcite,
which has a hardness of 3) and all harder minerals of Mohs Hardness Scale. However, it
is not scratched by (and instead scratches) #12* (gypsum, which has a hardness of 2) and
all softer Mohs minerals. Therefore, the hardness of specimen #16 is between a hardness
of 2 and 3, resulting in a hardness of 2.5.
Step 8: Repeat the above steps for each of the unknown minerals.
Step 9: Answer the questions below about the hardness of these minerals.
=

50
8
Minerals - Hardness of Unknown Minerals
Note: you must do the "Introduction and Mohs Hardness Scale" lab before doing
this lab since some of your results from that lab are needed to complete this one!
For this lab, you will test the hardness of unknown minerals by interacting with a website
developed by a geology professor, David J. Leveson, with photographs by Guillermo
Rocha, both from Brooklyn College. This site discusses mineral properties and testing
procedures and also provides an opportunity for you to practice testing minerals. Make
sure to read all of the information provided on each specified webpage as you attempt to
answer the questions. I recommend that you print this lab to keep track of your answers,
and then use those to input your answers into our online class site so that you can then get
credit for the laboratory exercise.
Determine the Hardness of Unknown Minerals
Using your knowledge of Mohs Hardness Scale, you will now determine a numerical
value for the hardness of assigned unknown minerals (specimen #s 1, 2, 4, 5, 10, 11, 13,
14, 15, 16, 17, 19, 20 and 22).
The hardness of any mineral can be determined by figuring out which two minerals the
unknown mineral lies between on Mohs Hardness Scale. For example, imagine that an
unknown mineral is scratched by quartz, but is not scratched by orthoclase. Instead, the
unknown mineral scratches the orthoclase. Since quartz has a hardness of 7, and
orthoclase has a hardness of 6, our unknown mineral would have a hardness of 6.5. It is
also possible for a mineral to have a hardness exactly that of the hardness of one of the
Mohs Minerals. In that case, they will not scratch each other, and the hardness of the
unknown will be a whole number equal to that of the hardness of the Mohs mineral.
Knowing the hardness of an unknown mineral is often useful in identifying it. For
example, apatite and beryl are often very similar in appearance. However, they have very
different hardness. Apatite has a hardness of 5, while beryl has a hardness of 7.5 to 8.
Therefore, a simple hardness test can help distinguish them.

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