geology-Using the Key and the Mineral Images Guide
No.
Luster
Cleavage Color
Metallic
Present
Metallic
None
Metallic
None
Non-Metallic Present Light
Non-Metallic Present
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Light
Non-Metallic Present
Non-Metallic Present
Light
Light
Non-Metallic Present
Non-Metallic Present
Non-Metallic Present
Non-Metallic Present
Light
Light
Dark
Dark
Non-Metallic Present
Non-Metallic None
Non-Metallic None
Non-Metallic None
Dark
Light
Light
Dark
Name
Properties
Galena
Shiny, silver-gray; excellent cubic cleavage
Graphite
Shiny, silver-gray; noas a collection of cubic
Brassy-yellow; often form
Pyrite
crystals
Light gray-white color; two planes of
Plagioclase
cleavage at 90°
Peachy-pink color; two planes of cleavage at
Microcline (Orthoclase) 90°
Clear-light brown; one plane of cleavage;
Muscovite
transparent-translucent
Clear-white; transparent-translucent;
Calcite
cleavage at 75°
Clear-white; transparent-translucent; one
Gypsum
good plane of cleavage; two poor planes
Clear-white; transparent-translucent; cubic
Halite
cleavage
Augite
Dark green; cleavage planes at 90°
Hornblende
Black; cleavage planes at 60° and 120°
Clear-black; one plane of cleavage;
Biotite
transparent -translucent
Quartz
Clear-translucent; no cleavage
Kaolinite
Chalk-like; white
Hematite
Red-brown; small round nodules