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OrbitalPete t1_j6m8ett wrote

Reply to comment by torama in can gemstones be melted into a gradient? by Acceptable_Shift_247

You only start crystallising quartz in a silicate melt (I.e. magma) below about 800 degrees. Above that the silica only gets accommodated in other minerals.

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torama t1_j6msxjm wrote

Solubility of phases and their precipitation is not really related to their melitng points. Things can dissolve or precipitate at wildly different temeperatures.

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