Sulfides Flashcards
1
Q
Chalcocite
A
Cu2S
- putina (green colour from copper)
- dark lead-gray
- streak gray or black
- shiny
- can be cut with knife
- very brittle
2
Q
Covellite
A
CuS
- Indigo or dark blue
- cleaves into thin sheets (chalcocite has no cleavage)
- streak lead-gray to black
- tiny peacock flakes can be see in host rock
3
Q
Bornite
A
Cu5FeS4
- coppery or bronze with peacock tarnish
- no cleavage
- streak pale grey-black
4
Q
Chalcopyrite
A
CuFeS2
- tetrahedral crystals
- deep brass of golden yellow with iridecent tarnish
- greenish-black streak
5
Q
Pyrrhotite
A
Fe1−xS
- bronze with dark brown tarnish
- magnetic
- no cleavage
6
Q
Pyrite
A
FeS2
- Pale-yellow to brass
- streak greenish black
- often in striated cubes; isometric
- Might appear granular like pyrrhotite, need to look with hand lens in order to distinguish
7
Q
Marcasite
A
FeS2
- radiating lenses (coxcombs spears)
- pale brass-yellow to white with yellow or brown tarnish
8
Q
Pentlandite
A
(Fe,Ni)9S8
- <span>usually in light, bronze-yellow masses</span>
- <span>light bronze-brown streak</span>
- <span>not out in lab</span>
9
Q
Galena
A
PbS
- dark lead-gray cubes or octahedrons
- perfect cubic cleavage
- streak lead-gray
- very dense
10
Q
Sphalerite
A
ZnS
- resinous or adamantine crystals
- perfect dodecahedral cleavage
11
Q
Cinnabar
A
HgS
- Bright red to brownish
- usually granular
- heavy
- scarlet streak
12
Q
Realgar
A
AsS
- usually earthy
- deep red or orange colour
- streak orange-yellow
- in the photo realgar is red
13
Q
Orpiment
A
As2S3
- lemon-yellow
- streak lemon-yellow
- cleaves into thin flexible flakes with peraly luster
14
Q
Stibnite
A
Sb2S3
- lead-gray with black tarnish
- will make dark lead-gray streak on paper
15
Q
Molybdenite
A
MoS2
- blushish-lead gray
- greenish-black streak on paper
- cleaves into flexible sheets
- mild greasy feeling
16
Q
Arsenopyrite
A
FeAsS
- silver-white to steel gray
- streak grayish black
- usually massive or in prismatic crystals (small)
- heavy
