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EOSC210 Rocks

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Fe3O4
ā— Strongly magnetic
ā— High specific gravity
ā— Lustre: Metallic dull
ā— Colour: Black
ā— Streak: Black
ā— Hardness: 5.5-6
PbS 
ā— Perfect 3 way cleavage at 90 degrees
ā— High specific gravity
ā— Habit: Cubic shape
ā— Lustre: Metallic bright
ā— Colour: Greyish blue
ā— Streak: Greyish black
ā— Hardness: 2.5
Fe2O3
ā— Lustre: Metallic/ Earthy/ Dull
ā— Colour: Reddish grey/ Black/Blackish red
ā— Streak: Reddish brown
ā— Hardness: 6.5
FeS2
ā— Habit: Cubic, isometric (Moregeometric than Chalcopyrite)
ā— Lustre: Metallic
ā— Colour: Pale brass yellow
ā— Streak: Greenish black
ā— Hardness: 6.5
CuFeS2
ā— Lustre: Metallic
ā— Colour: Bright brass yellow (sometimes golden)
ā— Streak: Greenish black
ā— Hardness: 3.5
CaCO3
ā— Strong reaction with acid
ā— Perfect 3 way cleavage at 120/60 degrees
ā— Lustre: Vitreous/ Glassy
ā— Colour: Colourless/ White/ Yellow (could also be pink and brown sometimes)
ā— Streak: White
ā— Hardness: 3
(Ca, Na)
(Mg, Fe, Al)
(Si, Al)2O6
ā— Perfect 2 way cleavage at 90 degrees
ā— Lustre: Vitreous
ā— Colour: Brown green, Green, Light brown, Dark brown, Black
ā— Streak: Greenish white
ā— Hardness: 5-6.5
NaAlSi3O8
ā— Perfect 2 way cleavage at 90 degrees
ā— Polysynthetic twinning/ Albite twinning
ā— Lustre: Vitreous/ Glassy
ā— Colour: White
ā— Streak: White
ā— Hardness: 5-6.5
SiO2
ā— Prismatic
ā— Conchoidal fracture
ā— Lustre: Vitreous/ Glassy
ā— Colour: Variable
ā— Streak: White
ā— Hardness: 7
(K, Na)AlSi3O8
ā— Perfect 2 way cleavage at 90 degrees
ā— Perthitic texture
ā— Carlsbad twinning
ā— Lustre: Vitreous/ Glassy
ā— Colour: Variable but Pink/
Colourless/ White most common
ā— Streak: White
ā— Hardness: 6
(Ca, Mg, Fe, Mn)3
Al2Si3O12
ā— Habit: Dodecahedron, isometric
ā— Lustre: Vitreous/ Resinous
ā— Colour: Reddish brown
ā— Streak: White
ā— Hardness: 7-8
(Na,K)0-1
(Ca, Na, Mg, Fe)2
(Mg, Fe, Al)5
(Si, Al)8O22
(OH)2
ā— 60/120 degree cleavage
ā— Lustre: Vitreous
ā— Colour: Black
ā— Streak: White
ā— Hardness: 5-6
(Mg2Fe)2SiO4
ā— Conchoidal fracture
ā— Lustre: Vitreous/ Glassy
ā— Colour: Yellowish green, Olive green, Greenish black (sometimes reddish brown)
ā— Streak: White
ā— Hardness: 6.5-7
KAl2
(AlSi3O10)
(F, Cl, OH)2
ā— Perfect one way (basal cleavage)
ā— Lustre: Vitreous/ Pearly
ā— Colour: White, Gray, Silver white
ā— Streak: White
ā— Hardness: 2.5
K(Mg, Fe)3
(AlSi3O10)
(F, Cl, OH)2
ā— Perfect one way (basal cleavage)
ā— Lustre: Vitreous/ Pearly
ā— Colour: Black, Dark brown,
Blackish brown
ā— Streak: Grey
ā— Hardness: 2.5-3
CaSO4 ā€¢ 2H2O
ā— Lustre: Pearly
ā— Colour: White, Colorless, Yellowish white
ā— Streak: White
ā— Hardness: 2
Indicates high grade metamorphism
ā— Penetration twins (Cross twins)
ā— Lustre: Vitreous/ Dull
ā— Colour: Brownish yellow, Brownish black, Yellow brown, Dark brown, Reddish brown.
ā— Streak: Grey
ā— Hardness: 7-7.5
Indicates high grade metamorphism (equal or greater than Staurolite)
ā— Habit: Blade-like
ā— Lustre: Vitreous/ Pearly
ā— Colour: Commonly blue (sometimes white, grey, green, black)
ā— Streak: Grey
ā— Hardness: 
Parallel = 4.4.5
Perpendicular = 6.5
ā— Composition: Mafic
ā— Formation: Intrusive
ā— Texture: Crystalline, Phaneritic
ā— Minerals: Calcium rich: pyroxene; olivine; plagioclase feldspar; amphibole
ā— Composition: Felsic
ā— Formation: Intrusive
ā— Texture: Crystalline, Phaneritic
ā— Minerals: Sodium rich: quartz; potassium feldspar; biotite; amphibole
ā— Composition: Mafic
ā— Formation: Extrusive
ā— Texture: Non-crystalline, Glassy
ā— Conchoidal fracture
ā— Composition: Mafic
ā— Formation: Extrusive
ā— Texture: Non-crystalline, Glassy
ā— Light weight
ā— Very porous
ā— Composition: Mafic
ā— Formation: Extrusive
ā— Texture: Crystalline, Aphanitic
ā— Minerals: Calcium rich: pyroxene; olivine; plagioclase feldspar; amphibole
ā— Composition: Felsic
ā— Formation: Extrusive
ā— Texture: Noncrystalline, Fragmental/pyroclastic
ā— Composition: Mafic
ā— Formation: Extrusive
ā— Texture: Crystalline, Porphyritic
ā— Minerals: Pyroxene; plagioclase feldspar; amphibole
ā— 2 stage cooling
ā— Sheet-like texture (Slatey)
ā— Low grade
ā— Fine-grained
ā— Composition: Micas, quartz
ā— Protolith: Mudstone/shale
ā— Formation: Regional/dynamic
ā— Schistosity
ā— Medium grade
ā— Medium coarse-grained
ā— Composition: Micas, kyanite, garnet
ā— Protolith: Mudstone/shale
ā— Formation: Regional/dynamic
ā— Gneissosity (Compositional banding)
ā— High grade
ā— Medium coarse-grained
ā— Composition: Quartz, feldspar
ā— Protolith: Granite and mudstone/shale
ā— Formation: Regional/dynamic
ā— Low-high grade
ā— Reacts strongly to acid
ā— Hardness: 3
ā— Composition: Calcite, dolomite
ā— Protolith: Limestone
ā— Formation: Contact
ā— Medium-high grade
ā— No reaction to acid
ā— Hardness: 7
ā— Composition: Quartz
ā— Protolith: Sandstone
ā— Formation: Contact
ā— Very fine grain
ā— Well-sorted
ā— Rounded grains
ā— Environment: River, lake, swamp; less likely in tidal flat or lagoon
ā— >15% fine grained matrix like clay
ā— Composed of mostly rock fragments
ā— Fine-grained
ā— Well sorted/ Poor graded
ā— Angular, low sphericity
ā— Environment: River (High energy settings)
ā— Coarse-grained
ā— Poorly-sorted
ā— Poorly rounded, low sphericity
ā— Commonly reddish in colour
ā— Environment: River (High energy settings)
ā— Coarse-grained
ā— Well-sorted
ā— Rounded, high sphericity
ā— Environment: Desert (red), beach, river
ā— Coarse-grained
ā— Poorly sorted
ā— Rounded, high sphericity
ā— Grains of varying composition
ā— Environment: River (Medium to high energy setting)
ā— Coarse-grained
ā— Poorly sorted
ā— Angular, low sphericity
ā— Grains of varying composition
ā— Environment: River (High energy setting)
ā— Conchoidal fracture
ā— Very fine-grained, undistinguishable grains
ā— Contains mainly quartz
ā— Environment: Deep marine
ā— Reacts strongly with acid
ā— Composed of Calcite
ā— Medium to coarse-grained
ā— May contain fossils
ā— Environment: Shallow marine
ā— Composed of Halite/table salt or Gypsum
ā— Medium to coarse-grained
ā— Environment: Tide pools, lagoon
ā— Composed of organic material
ā— Environment: Swamp