If you find a rock with a dominance in quartz minerals, that should tell you as a geologist that the magma chamber in which the quartz crystallized was around 500°C.

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Quartz is a common mineral found in igneous rocks. The temperature at which quartz crystallizes from magma is dependent on the pressure and composition of the magma. At a pressure of 1 atmosphere, quartz crystallizes from magma at a temperature of about 870°C. However, the presence of other minerals in the magma can lower the crystallization temperature of quartz. For example, the presence of water can lower the crystallization temperature of quartz to as low as 500°C.

If You Find a Rock with a Dominance in Quartz