Quick Review What is the difference between rocks and minerals? A mineral is a pure substance while a rock is a mixture of minerals.

Other ways to identify minerals 1. Colour of solid What colour is the mineral? Sometimes the colour is not consistent due to impurities in the mineral. We can get a better idea of the real colour by looking at the inside of a mineral

Other ways to identify minerals 2. Lustre Does the mineral appear pearly (like a shell)? Glassy? Oily?

Other ways to identify minerals 3. Streak When you rub a mineral against porcelain, it can leave a coloured mark behind. Different minerals have different coloured streaks. Hematite

Other ways to identify minerals 3. Streak When you rub a mineral against porcelain, it can leave a coloured mark behind. Different minerals have different coloured streaks.

Other ways to identify minerals 4. Hardness How easy is it to scratch the mineral? Some can be scratched easily, some need tools such as knives. Hardness can be ranked on a scale of 1 to 10 (1= softest, 10 = hardest). This is called the Mohs Scale.

Other ways to identify minerals 4. Hardness Can you cut calcite using apatite? ____ Can you cut quartz using feldspar? ____ Can you cut topaz using diamond? ____ Can you cut diamond using diamond? ____

Other ways to identify minerals 5. Magnetism Is the object attracted by a magnet? Or does it cause a compass needle to move toward the mineral?

Other ways to identify minerals 6. Reaction with Acid Does the mineral react with acid? If it does, it will produce bubbles (release of gas, chemical change!) This is called effervescence.

Other ways to identify minerals 7. Cleavage or fracture Does the mineral break into smooth pieces (cleavage) or sharp pieces (fracture)? Cleavage: Sometimes layers are visible.

Homework Workbook p. 140-141