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While there are forms of glass that do occur in nature (called 'obsidian') these are usually darkly coloured and (because glass is unstable) denature over time. They are formed when an acid lava cools very quickly and our ancient ancestors in the stone age (in the great rift valley of East Africa) did 'mine' this to make sharp stone tools (the equivalent of flint)but this is the only example of glass being mined.
Glass is made by heating quartz sand with sodium carbonate in a furnace till the ingredients melt. It is a man made product.
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