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Corel Day 2 > sulfides 5-8 SET 2 > Flashcards

sulfides 5-8 SET 2 Flashcards

1
Q

chalcopyrite formula

A

CuFeS2

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2
Q

chalcopyrite crystal form

A
  • tetragonal, tetrahedral bc of disphenoid 112
  • usually massive
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3
Q

chalcopyrite cleavage

A

none. brittle

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4
Q

chalcopyrite hardness

A

3.5 to 4

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5
Q

chalcopyrite specific gravity

A

3.1 to 3.4

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6
Q

chalcopyrite color

A

metallic. brass yellow
tarnished: bronze or iridescent
greenish black streak

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7
Q

chalcopyrite occurrence

A
  • important copper ore mineral
  • low temp hydrothermal veins, found with galena, sphalerite and dolomite
  • high temp deposits with pyrrhotite and pentlandite
  • primary mineral of PCDs
  • primary constituent of igneous rocks, in pegmatites
  • in contact metamorphic deposits
  • disseminated in metamorphic schist
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8
Q

chalcopyrite remarks

A

brass yellow color, greenish black streak

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9
Q

how to differentiate pyrite and chalcopyrite

A

chalco is softer than steel knife. it’s softer

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10
Q

how to differentiate pyrite and gold

A

chalco is britte, gold is malleable

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11
Q

pyrrhotite formula

A

(Fe(1-x)S)x; x=0-0.2

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12
Q

pyrrhotite crystal form

A
  • hexagonal for high temp, uncommon crystals
  • usually massive granular
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13
Q

pyrrhotite cleavage

A

none

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14
Q

pyrrhotite hardness

A

4

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15
Q

pyrrhotite specific gravity

A

4.58 to 4.65

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16
Q

pyrrhotite color

A

metallic opaque, brownish bronze, black streak

17
Q

pyrrhotite occurrence

A
  • often disseminated grains in basic igneous rocks, such as norites
  • in sulfide ore deposits assoc with pentlandite, chalcopyrite, and other sulfides
18
Q

what is a special characteristic of pyrrhotite

A

magnetism: intense and variable. easily attracted to magnets, but less magnetic than magnetite

19
Q

pyrrhotite remarks

A

massive variety assoc with pentlandite

20
Q

how to tell pyrrhotite from chalcopyrite

A

pyrrhotite is brownish bronze and is magnetic, chalco is brass yellow and is not

21
Q

how to tell pyrrhotite from pyrite

A

pyrrhotite id brownish bronze, pyrite is pale brass yellow, also pyrite is harder

22
Q

pentlandite formula

A

(Fe,Ni)9S8

23
Q

pentlandite crystal form

A
  • isometric, mostly massive
  • granular aggregates with octahedral parting
24
Q

pentlandite cleavage

A

none. octahedral parting on 111

25
Q

pentlandite hardness

A

3.5 to 4

26
Q

pentlandite specific gravity

A

4.6 to 5

27
Q

pentlandite color

A

metallic opaque yellowish bronze. light bronze brown streak

28
Q

pentlandite occurrence

A
  • major nickel ore mineral
  • in basic igneous rocks assoc with nickel sulfides, pyrrhotite and chalco
  • probably formed by magmatic segregation
29
Q

pentlandite remarks

A
  • commonly assoc with pyrrhotite, closely resembles
30
Q

how to distinguish pentlandite from pyrrhotite

A

pentlandite has octahedral parting and not magnetic

31
Q

how to detect presence of nickel in pentlandite

A

with dimethylglioxime. if this powder is dissolved in some water on pentlandite sample, scarlet coloration forms

32
Q

covellite formula

A

CuS

33
Q

covellite crystal form

A
  • rarely tabular hexagonal crystals
  • usually massive as coatings or disseminations thru other copper minerals
34
Q

covellite cleavage

A

perfect basal 001

35
Q

covellite hardness

A

1.5 to 2

36
Q

covellite specific gravity

A

4.6 to 4.76

37
Q

covellite color

A

metallic opaque, also often iridescent. indigo blue or darker. lead gray to black streak

38
Q

covellite occurrence

A
  • commonly found in most copper ore deposits as supergene mineral
  • found with other copper mineral and derived from them thru alteration, mainly chalcocite, bornite, chalcopyrite and enargite
39
Q

covellite remarks

A
  • indigo blue color
  • its micaceous cleavage yielding flexible plates
  • association with other copper minerals

Corel Day 2 (17 decks)

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