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EOSC 220: Introductory Mineralogy > Lab 4: Sulphides, Oxides & Hydroxides > Flashcards

Lab 4: Sulphides, Oxides & Hydroxides Flashcards

1
Q

Pyrite

A 
formula: FeS2
Streak: greenish-black-gold
Hardness: 6
Habit(s): cubic
Other: striations
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2
Q

Corundum

A 
Formula: Al2O3
Lustre: vitreous, adamantine
Hardness: 9
Habit(s): prismatic
Crystal System: hexagonal
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3
Q

Hematite

A

Formula: Fe2O3
Streak: red-brown
Crystal System: hexagonal
Hardness: 5-6

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4
Q

Chalcocite

A

Formula: Cu2S
Streak: dark-gray
Hardness: 2.5 -3
Other: greenish weathering, sooty coating

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5
Q

Chalcopyrite

A

Formula: CuFeS2
Colour: green-gold
Hardness: 3.5
Other: tarnishes copper-green

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6
Q

Covellite

A 
Formula: CuS
Lustre: metallic, pearly
Colour: deep-blue-purple, oil spill on wet road
Hardness: 1.5 -2
Cleavage: perfect basal
Habit(s): platey, foliated
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7
Q

Bauxite

A

It’s an aluminium ore, hydroxide assemblage.
pseudo-pisolitic
red and soft

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8
Q

Magnetite

A

Formula: Fe3O4
Streak: black
Magnetism: yes
Crystal System: isometric

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9
Q

Ilmenite

A 
Formula: FeTiO3
Colour: black (dark-gray)
Streak: black
Magnetism: yes (weak)
Habit(s): massive, tabular
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10
Q

Pyrrhotite

A

Formula: Fe(1-x)S
Colour: bronze
Magnetism: weak
Hardness: 3.5 - 4.5

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11
Q

Arsenopyrite

A

Formula: FeAsS
Colour: light steel gray
Streak: black
Other: striations, no cubic

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12
Q

Rutile

A 
Formula: TiO2
Lustre: metallic, adamantine
Colour: gray, oxidized red-brown
Streak: white
Crystal System: tetrahedral
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13
Q

Goethite

A 
Formula: FeO(OH)
Lustre: dull, silky, earthy
Colour: gray-brown-red
Streak: yellow brown
Magnetism: yes (weak)
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14
Q

Marcasite

A

Formula: FeS2
Colour: white-gold, grey-green
Habit(s): tabular
Other: paler than pyrite

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15
Q

Chromite

A

Formula: FeCr2O4
Streak: brown (on black plate)
Magnetism: No (difference from magnetite)

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16
Q

Pentlandite

A 
Formula: (Fe, Ni)9S8
Lustre: metallic, adamantine
Colour: bronze, brown-gold
Magnetism: no
Other(s); shiny, brassy, doesn't exist w/o pyrrhotite

EOSC 220: Introductory Mineralogy (4 decks)

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