Use Streak Test for Ore Minerals

Ore_Minerals.doc

9/23/2001

Use streak test for ore minerals

graphite
·  C
·  soft
·  light weight
·  greasy
·  dark
galena
·  PbS
·  heavy
·  good cubic cleavage
·  black to silver
hematite
·  Fe2O3
·  specular (#3), earthy (#10)
·  sometimes a little magnetic
·  read-brown streak
·  red to silvery gray
magnetite
·  Fe3O4
·  magnetic
·  black streak
·  metallic luster; black
limonite
·  Fe2O3۰H2O
·  soft
·  yellow-brown streak
sulfur
·  S
·  might smell of sulfur
·  yellow-brown streak
·  yellow
azurite
·  Cu3CO3(OH)2
·  blue
malachite
·  Cu2CO3(OH)2
·  green
pyrite
·  FeS2
·  harder than steel
·  good cubes
·  environment possible for gold deposition
·  black streak
·  brassy to golden yellow
chalcopyrite
·  CuFeS2
·  softer than steel
·  metallic luster; little greenish gold
sphalerite
·  ZnS
·  good cleavage in many directions
·  sulfur smell
·  pale yellow streak
·  luster

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