MOHS HARDNESS SCALE

1
MOHS HARDNESS SCALE

• This is a mineral's resistance to scratching. It
  is a relative scale. Minerals with higher
  numbers will scratch minerals below them on the
  scale.

1. Talc 2. Gypsum 3. Calcite 4.
Fluorite 5. Apatite
6. Orthoclase 7. Quartz 8. Topaz 9.
Corundum 10. Diamond
2
SPECIFIC GRAVITY I

• This is the ratio of the density of the mineral
  to the density of water.
• Weight Air/(Weight Air-Weight in water)
  specific gravity

3
SPECIFIC GRAVITY II

• increases with increasing atomic weight of the
  cation. For example in the orthorhombic
  carbonates
• Aragonite CaCO3 2.95
• Strontianite SrCO3 3.76
• Witherite BaCO3 4.29
• Cerrusite PbCO3 6.55