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2.6 What determines the <br />physical properties of minerals?
- Bond type and order:
- Quartz - all covalent, Hardness (H): 7
- Calcite - covalent and ionic, H: 3
- Ca2+ - hardness determined by the weaker ionic bond
- Halite (NaCl), in ionic form Na+, H: 2.5
- For ionic compounds, hardness is proportional to charge
- Graphite - covalent and van der Waals, H: 2