Description
Using the Key and the Mineral Images Guide, identify the 15 minerals. On the Word file provided, list the identified minerals by number, and briefly explain how you identified each.
GEO101L_Lab3_Key – Minerals.pdf
GEO101L_Lab3_Mineral_Images.pdf
GEO101L_Lab3_Answer sheet.docx
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Luster
Metallic Luster
Cleavage
Color
Cleavage present
Name
Galena
No Cleavage
Light in Color
Cleavage Present
Non-‐metallic Luster
Dark in Color
Light in Color
Cleavage Absent
Dark in Color
Properties
Shiny, silver-‐gray; excellent cubic
cleavage
Graphite
Shiny, silver-‐gray; no form
Pyrite
Brassy-‐yellow; often as a collection
of cubic crystals
Plagioclase
Light gray-‐white color; two planes
of cleavage at 90°
Microcline
(Orthoclase)
Peachy-‐pink color; two planes of
cleavage at 90°
Muscovite
Clear-‐light brown; one plane of
cleavage; transparent-‐translucent
Calcite
Clear-‐white; transparent-‐
translucent; cleavage at 75°
Gypsum
Clear-‐white; transparent-‐
translucent; one good plane of
cleavage, two poor planes
Halite
Clear-‐white; transparent-‐
translucent; cubic cleavage
Augite
Dark green; cleavage planes at 90°
Hornblende
Black; cleavage planes at 60° and
120°
Biotite
Clear-‐black; one plane of cleavage;
transparent-‐translucent
Quartz
Clear-‐translucent; no cleavage
Kaolinite
Chalk-‐like; white
Hematite
Red-‐brown; small round nodules
Cleavage plane 1
1
Cleavage plane 2
Top view
1
Cleavage plane 1
2
3
5
4
6
Broken end
8
7
9
10
Side view
11
Top view
12
Top
Bo=om
13
14
15
Identify the following minerals using the Key provided. Place the names with the
appropriate number.
Augite, Biotite, Calcite, Galena, Graphite, Gypsum, Halite, Hematite, Hornblende,
Kaolinite, Microcline (Orthoclase), Muscovite, Plagioclase, Pyrite, Quartz
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15.
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