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26 Cards in this Set

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Feldspars
K, NA, CA AL-Silcates
two good cleavages that intersect at 90
Mohs hardness of 6
Vitreous Luster
striations
Quartz
SiO2
Moh hardness 7
conchoidal fracture
vitreous--somewhat gray luster
Amphiboles
Complex Hydrous Na, Ca, Mg, and Fe Al Silicates

Hornblend most common
Black mineral with two directions of good cleavage 60-120
splintery look
Pyroxenes
Ca, Mg, and Fe Silicates
augite most common
greenish-black
two cleavages that intersect at the 90
not splinter looking
Micas
Hydrous K, Mg, and Fe,Al Silicates
biotite and muscovite common
biotite: black
muscovite commonly is colorless to pale gray
Cleavage and vitreous luster
Chlorite
Hydrous Mg and Fe Al Silicate
dark green
one perfect cleavage
flexible but not elastic
Talc
Hydrous Mg al Silicate
mohs hardness 1
one perfect cleavage
pearly luster, greasy feel,a nd softness are distinctive
Clays
Hydrous al- Silicates
<0.004mm
extremely small crystal size
dull luster
softness
earthly odor
Olivine
Mg, Fe Silicate
yellowish green--green
granular
multiude of small grains (crystals)
conchoidal crystals
H: 6.5-7
Calcite and Dolomite
CaCO3 and CaMg(CO3)2
CaCO3- 3 cleavages, mohs 3
reacts to HCL
Gypsum
CaSO4*2H2O
white to gray
Satin spar: to clear crystals or cleavage fragments
Selenite: one or two poor cleavages
Halite
NaCl
taste like salt
colorless or white
perfect cubic cleavages
H: 2.5
Fluorite
CaF2
colorless, pale yellow, light green, purple
cubic or octahedral cleavage fragments
H: 4
Reacts to HCL
Serpentine
Hydrous Mg Silicate
greasy to waxy luster
H: 3-5
Garnet
Ca, Mg, Fe, and Al Silicate
H: 6.5-7.5
vitreous or resinous luster
brownish red- black, brown, yellow, green and other colors
Staurolite
Hydrous Fe Al Silicate
dark brownish crystals
Kyanite
(Al2SiO5)
light blue and forms blade-shaped crystals
Hematite
Fe2O3
red to red brown streak
redish brown, soft earthy material
and could be dull black and hard
H: 1-6
Magnetite
Fe304
Magnetic
H: 6
Heavy
Limonite
Varuiys Fe Oxides
H: 1-5.5
earthy (yellow ochre)
compact, smooth dark adn rounded masses
Metalic
streak: yellow brown
Galena
Metallic Luster
three perfect cleavages 90
very high specific gravity
Sphalerite
ZnS
Color: yellow, brown, black
luster resinous
h: 3.5-4
6 cleavages
yellow-brown streak
rotten-egg odor
Pyrite
FeS2
pale brass-yellow
metallic luster
cubes, pyritohedrons
H: 6-6.5
Graphite
C
dark gray, silver gray, or black
greasy
soft
Bauxite
Various Al Oxides
white, greay , or red
soft, dull and earthy
Identify a Minieral
Luster (nonmetallic, metallic, vitreous)
Hardness
Streak
Cleavage
Color
Other
HCL Test