week 1 mineral identification

Topics: Mineral, Mohs scale of mineral hardness, Mineralogy Pages: 5 (853 words) Published: October 19, 2014


September 28, 2014
GLG 101

Part 1: Recording Observations

In the chart below, record your observations of each test for the seven minerals. After you have completed all tests, name the minerals in Part 2 of this worksheet. An example of how to fill out the chart is illustrated below.

Recorded Observations for Minerals 1–7
Tests
Example
Mineral 1
Mineral 2
Mineral 3
Mineral 4
Mineral 5
Mineral 6
Mineral 7
Color
White
Gold
Green
White
Pink
White
White
Black
Streak
White
Black
White
White
White
White
White
Brown
Luster
Shiny
Has shiny specs
Shiny
Dull
Dull
Pearly
Shiny
Shiny
Specific Gravity
3.18
5.1
2.80
2.70
2.60
2.65
2.40
2.20
Cleavage & Fracture
Cleavage
Has fracture
Fracture
Cleavage
Fracture
Fracture
Cleavage
Fracture
Hardness
4
Abt. 7
3.1-5.4
1
6
7
2
2
Acid
No Reaction
No Reaction
No Reaction
Active Bubbling and Fizz
No Reaction
No Reaction
No Reaction
No Reaction

Part 2: Naming the Minerals

Name the minerals below. Then, insert a percentage of how certain you are in your identification. Finally, explain your percentage of certainty: What was confusing about this mineral? What other minerals do you think it could be?

Remember, the minerals in the virtual lab include seven of the following: borax, calcite, corundum, graphite, gypsum, orthoclase feldspar, pyrite, quartz, talc, and topaz.

Identification of Mineral
Percent Certain
Explanation of Certainty
Example: Fluorite
80% certain
I am almost certain this mineral is fluorite, but I am not completely sure. Fluorite and gypsum are both white, shiny, have white streaks, cleave, and show no reaction to acid. However, the specific gravity of this mineral is 3.18, which is higher than gypsum, so I am pretty sure it is fluorite. Mineral 1: Pyrite

80% certain
I am almost sure that this mineral is pyrite because it is gold and has a black streak. The only thinks that do not match up is the specific gravity and the hardness. Mineral 2: Talc
100% certain
I am certain that this mineral is talc because the hardness, specific gravity, color, streak and acid reaction are all the same. I am almost sure that this mineral is pyrite because it is gold and has a black streak. The only thinks that do not match up is the specific gravity and the hardness.. Mineral 3:Calcite

100% certain
I am certain that this mineral is calcite because it is the only mineral on the list that is white and had an active bubbling acid affect. Mineral 4: Orthoclase Feldspar
90% certain
I am almost certain that this mineral is orthoclase feldspar because everything matches but the hardness. The only other mineral it could be is corundum and the hardness is nine and I feel that that is way too high to be my mineral. My mineral matches best with orthoclase feldspar. Mineral 5:Quartz

100% certain
I am almost certain that this mineral is quartz because it completely matches the description. Mineral 6: Gypsum
100% certain
I am certain that this mineral is gypsum because the color, specific gravity, hardness, streak, luster and cleavage all match up to gypsum Mineral 7:Graphite
90% certain
I am almost certain that this mineral is graphite. The only thing that does not match up is the acid reaction. When I ran the test I did not see any reaction with the acid but graphite does react to acid. I did not see any other options because the mineral is black and the streak is brown. So I am almost positive that the mineral is graphite.

Part 3: Summary

Write a summary answering the following: What are the four requirements for a material to be classified as a mineral? How do you differentiate between minerals? Briefly summarize the six methods to tell minerals apart. Summarize the major differences between minerals and rocks.

For a solid to be classified as a mineral it must meet these four requirements: naturally solid, formed by inorganic processes, have characteristics of crystal...
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