Silicate Minerals

• Quartz


  colour : colourless

  streak : scratched the plate

  shape : prismatic crystals

  lustre : vitreous

  cleavage/fracture : none / conchoidal

  scratched by : N/A

  not scratched by : steel pin

  hardness : 7

  density : 2.6 g/cm3

  HCl test : no reaction
• Orthoclase Feldspar


  colour : light pink / brown

  streak : scratched streak plate

  shape : tabular crystals

  lustre : vitreous

  cleavage/fracture : 2 good cleavage planes at 90 degrees

  scratched by : none

  not scratched by : steel pin

  hardness : 6

  density : 2.6 g/cm3

  HCl test : no reaction
• Plagioclase Feldspar


  colour : white

  streak : scratched streak plate

  shape : tabular crystals

  lustre : vitreous

  cleavage/fracture : 2 good cleavage planes at 90 degrees

  scratched by : none

  not scratched by : steel pin

  hardness : 6

  density : 2.7

  HCl test : no reaction
• Muscovite Mica


  colour : colourless / white

  streak : 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

  HCl test : no reaction