Mafic Minerals

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Created by
imogen

Cards (4)

  • Biotite Mica

    colour : black / brown / grey
    streak : brown to white
    shape : flaky
    lustre : pearly
    cleavage/fracture : 1 perfect cleavage plane
    scratched by : finger-nail
    not scratched by : N/A
    hardness : 2.5
    density : 2.9 g/cm3
    HCl test : no reaction
  • Hornblende
    colour : black
    streak : scratched streak plate
    shape : long, prismatic crystals
    lustre : vitreous
    cleavage/fracture : 2 good cleavage planes
    scratched by : none
    not scratched by : steel pin
    hardness : 5-6
    density : 3.3 g/cm3
    HCl test : no reaction
  • Augite
    colour : black and white
    streak : scratches streak plate
    shape : prismatic crystals
    lustre : vitreous
    cleavage/fracture : 2 good cleavage planes at 90 degrees
    scratched by : none
    not scratched by : steel pin
    hardness : 6
    density : 3.3 g/cm3
    HCl test : no reaction
  • Olivine

    colour : green / some white
    streak : scratched streak plate
    shape : granular crystals
    lustre : vitreous
    cleavage/fracture : none
    scratched by : none
    not scratched by : steel pin
    hardness : 6-7
    density : 3.8 g/cm3
    HCl test : no reaction