In the League Directory, NFL.com users find fantasy leagues sorted by league type, draft type, draft date, scoring settings, and roster settings. The Details link under League Notes provides the league settings.
There are two known processes by which magma ceases to exist: by volcanic eruption, or by crystallization within the crust or mantle to form a pluton. In both cases the bulk of the magma eventually cools and forms igneous rocks.
Igneous/volcanic rocks are already composed of crystals that formed as the magma cooled. To recrystallize the rock itself, it needs to be heated to a high enough temperature to melt. Crystals unrelated to the parent rock can form in veins through processes of fracturing/fluid injection.