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Key Properties of Minerals

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Quiz by Doreling
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Last updated: September 15, 2017
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First submittedSeptember 15, 2017
Times taken34
Average score45.5%
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Key Property
Mineral
Reddish/brown streak
Hematite
Rusty streak
Limonite
Two planes of cleavage not at 90 degrees
Hornblende
Two planes of cleavage at 90 degrees
Augite
Two planes of cleavage at 90 degrees, no striations
Orthoclase Feldspar
Two planes of cleavage at 90 degrees, straiations
Plagioclase Feldspar
Conchoidal to irregular fracture, could have six sided crystal habit
Quartz
Conchoidal fracture, dull luster
Chert
One plane of cleavage, dark to black mica
Biotite
One plane of cleavage, light to white mica
Muscovite
Strongly magnetic, distinct black streak
Magnetite
Key Property
Mineral
Salty taste, three planes of cleavage at 90 degrees
Halite
Greenish gold in color
Chalcopyrite
Gold color often in cube crystal habit with straiations
Pyrite
Three planes of cleavage at 90 degrees, metallic luster, high specific gravity
Galena
Softer than a fingernail, three planes of cleavage not at 90 degrees
Gypsum
Softer than a fingernail, fracture or one plane of cleavage
Talc
Green in color, often grainy, harder than glass, fracture
Olivine
Streak smells of sulfur, six planes of cleavage
Sphalerite
Four planes of cleavage (octahedral), hardness between glass and a penny
Fluorite
Perfect rhombohedral cleavage, bubbles in HCl
Calcite
Low specific gravity, one plane of cleavage, submetallic luster
Graphite
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