-
- Calcite (CaCO3)
- -Colorless, white, yellow, pink or other colors
- -Cleavage not at right angles
- -Hardness = 3
- -Reacts to acid
-
Sulfur (S)
- -Yellow
- -Streak = Yellow
- -Yellow crystals or earthy masses, smells like rotten eggs
- -Hardness = 1.5 to 2.5
-
Chalcopyrite ( CuFeS 2)
- -Brassy yellow to gold or copper OR blue, purple, green
- -Streak = Dark grey to black
- -Hardness = 4 (will not scratch glass)
-
Pyrite (FeS 2)
- -Gold, brassy yellow
- -Streak= dark grey to black
- -Consistent color, small cubic crystals
- -Hardness = 6 (will scratch glass)
-
Graphite (C)
- -Dark grey (metallic to earthy)
- -Streak= grey to black
- -Greasy feel, writes on paper
- -Hardness = < 2
-
Galena (PbS)
- -Silver, shiny and metalic
- -Streak= Grey to black
- -Cubic cleavage good to excellent
- -HEAVY!
-
- Geothite [FeO(OH)]
- -Yellow to brown to red (earthy)
- -Streak: similar to color
- -Chalky
OR
- - Dark brown (metallic to earthy)
- -Similar to color
- -may have pitted texture (rusted iron)
-
- Hematite (Fe2O3)
- -Silver/grey, red
- -Streak= Red to dark brown
- -Glittery
- -Hardness =
-
- Magnetite (Fe3O4)
- -Dark grey to black
- -Streak = dark grey to black
- -MAGNETIC
- -High specific gravity
- -Hardness =
-
Sphalerite ( ZnS)
- -Dark brown/black, yellow to gold at edges.
- -Streak = white to pale yellow
- -6 cleavages, has crystal-like pattern
-
Bauxite
- -Earthy brown, pink, yellow, grey, white
- -Contains hard ROUND inclusion
- -Cleavage = none
-
Garnet
- -Black to dark red ro red/brown
- -Streak = none
- -Cleavage = distinctive 12 sided crystals
- -Hardness = 7 - 7.5
-
Talc
- -Opaque white, grey, green
- -Slippery, soapy feel
- -Pearly to greasy luster
- -Hardness = 1
-
Olivine
- -Pale olive green to yellow
- -Often seen as SAND SIZED CRYSTALS
- -Hardness = 7
- -Cleavage = None
-
Horneblende
- -Black to dark green
- -None or barely green/grey
- -Cleavage = non-prismatic
- -Shiny luster
- -Hardness = 5.5 - 6
-
Augite
- -Dark green to black
- -Streak = None or barely green/grey
- -Cleavage = prismatic
- -Luster = duull to shiny
- -Hardness = 5.5 - 6
-
Biotite Mica
- -Black (yellow to gold at edges)
- -Streak = None OR light brown/green
- -Cleavage = Excellent Basal
- -Hardness = 2.5, barely scratches with fingernail
-
Muscovite Mica
- -White to gold to light brown, Earthy
- -Streak = none
- -Cleavage = excellent basal
- -Hardness = 2-2.5, barely scratches with finger
-
Chalcedony (SiO 2)
- -Colorless, white, grey or pastel colors
- -WAXY to opalline luster, translucent or opaque
- - Hardness = 7
- -Cleavage = massive or laminated
-
- Quartz (SiO2)
- -Transparent or translucent
- -Vitreous(glassy) luster
- -Cleavage = Massive or hexagonal crystals
- - Hardness = 7
-
Plagioclase Feldspar
- -White to grey (most common), or pink
- -Cleavage = Prismatic, excellent or good
- -Hardness = 6
-
Orthoclase Feldspar
- - Pink or white (most common), grey or green
- -Cleavage = prismatic, good or excellent
- -Hardness = 6
- -
-
Malachite
- -Opaque green
- -Streak = pale green
- -May react to acid
-
Fluorite (CaF 2)
- -Colorless, purple, blue, green, or yellow
- -Cleavage = Excellent
- -Hardness = 4
-
Halite (NaCI)
- -Colorless, white or other colors
- -SALTY TASTE
- -Cleavage = excellent
- -Hardness = 2.5
-
Gypsum (CASO 4*2H 2O)
- -Clear to white
- -Easily scratched with fingernail, massive or tabular crystals.
- -Hardness = 2
- -Cleavage = Excellent or good
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