Rocks in the Earth's crust are made up of minerals.
Here are some:
- Quartz: Quartz is very hard. It can scratch glass. It is translucent. It can be white, pink or grey. It is found in granite.
- Feldspar: Feldspar is hard. It is not shiny. It can be different colours: white, green or brown. It is found in granite and clay.
- Calcite: Calcite is soft. It can be scratched with a knife. It can be white, orange or yellow. It is found in marble and limestone.
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