I think you may studied of other types of rocks. These are semi precious or so, used for jewellery. I'm not really familiar with them either but learning slowly.
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I think you may studied of other types of rocks. These are semi precious or so, used for jewellery. I'm not really familiar with them either but learning slowly.
Yeah these ones look like the ones in jewelries.
The ones I read in school is more of the soil forming types