Key Property | Mineral | % Correct |
---|---|---|
Reddish/brown streak | Hematite | 81%
|
Gold color often in cube crystal habit with straiations | Pyrite | 69%
|
Three planes of cleavage at 90 degrees, metallic luster, high specific gravity | Galena | 63%
|
Salty taste, three planes of cleavage at 90 degrees | Halite | 63%
|
Strongly magnetic, distinct black streak | Magnetite | 63%
|
Conchoidal to irregular fracture, could have six sided crystal habit | Quartz | 63%
|
One plane of cleavage, dark to black mica | Biotite | 56%
|
One plane of cleavage, light to white mica | Muscovite | 56%
|
Perfect rhombohedral cleavage, bubbles in HCl | Calcite | 50%
|
Softer than a fingernail, fracture or one plane of cleavage | Talc | 50%
|
Softer than a fingernail, three planes of cleavage not at 90 degrees | Gypsum | 44%
|
Two planes of cleavage at 90 degrees, straiations | Plagioclase Feldspar | 44%
|
Two planes of cleavage at 90 degrees | Augite | 38%
|
Two planes of cleavage not at 90 degrees | Hornblende | 38%
|
Two planes of cleavage at 90 degrees, no striations | Orthoclase Feldspar | 38%
|
Greenish gold in color | Chalcopyrite | 25%
|
Four planes of cleavage (octahedral), hardness between glass and a penny | Fluorite | 25%
|
Green in color, often grainy, harder than glass, fracture | Olivine | 25%
|
Streak smells of sulfur, six planes of cleavage | Sphalerite | 25%
|
Low specific gravity, one plane of cleavage, submetallic luster | Graphite | 19%
|
Rusty streak | Limonite | 19%
|
Conchoidal fracture, dull luster | Chert | 13%
|
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