Think about it. Does anybody make quartz? Where do you think it is found?
Think about it. What do you think it is made of? It has lots of different types of crystals and they are all jumbled up together.
Think about it. Can you make gold? You make gold jewellery, but where do you find gold nuggets?
Think about it. Do you know where amber comes from? We do not make amber, but something else can.
Think about it. You find it after you have had a fire. It is black and looks like a mineral, but where does it come from?
Think about it. It may not look like a gemstone, but where do we find it? What do you think it looks like? Do you think people make it?
Think about it.
Who makes plastic?
It may look pretty inorganic, but do you know what plastic is made from?
Think about it. They are not found in underground mines, but do icebergs occur naturally? Are icebergs solid? What are they made of?