Lucky for you for the last 2 years I studied mineralogy, one dude Bowen made a chart of how things crystalize, there are few stages of crystalization in magma depending on temperature, viscous magma contains volatiles and Quartz which crystalize at lower temps, meanwhile crystalization starts at around 1400°c and some complex minerals are forming, the answer to your questions, magma contains crystals and amourph crystals and has good adhesion so no nothing mixes
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