Magmatic deposits /ˈmæɡˌmætɪk dɪˈpɒzɪts/ -formed when melts containing valuable elements (chromium, titanium, iron, platinum, copper, nickel, etc.) solidify. Pegmatites are splittings of the final products of cooling magma; contain feldspar, quartz, muscovite, fluorite, precious stones) lithium and rillium compounds.