Garnet

What is a garnet? A garnet is a red- to purple-coloured semi-precious stone.

Garnets in a heat and pressure-formed rock called a schist.

Garnets (which you can see in the picture above as red, orange and purple stones sticking out from a silvery-looking rock) are formed deep within mountains, where rocks like shale are squashed and heated so much that new minerals form. Most of the shale becomes a mineral called mica, which is made of plates. That is what gives the example a shiny look. But among the mica, garnets grow.

Video: garnet.

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