Earth Science Lab3 - Excellent Plagiarism free work
gwcthe
lab3_key.pdf
Luster Cleavage Color Name Properties
Metallic Luster Cleavage present Galena
Shiny, silver-‐gray; excellent cubic cleavage
No 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°
Light in Color Muscovite
Clear-‐light brown; one plane of cleavage; transparent-‐translucent
Cleavage Present Calcite
Clear-‐white; transparent-‐ translucent; cleavage at 75°
Gypsum Clear-‐white; transparent-‐ translucent; one good plane of cleavage, two poor planes
Non-‐metallic Luster Halite
Clear-‐white; transparent-‐ translucent; cubic cleavage
Augite Dark green; cleavage planes at 90°
Dark in Color Hornblende
Black; cleavage planes at 60° and 120°
Biotite Clear-‐black; one plane of cleavage; transparent-‐translucent
Light in Color Quartz Clear-‐translucent; no cleavage
Cleavage Absent Kaolinite Chalk-‐like; white
Dark in Color Hematite Red-‐brown; small round nodules
