Liquidus phase relationships determined on the join anorthite-forsterite-quartz at 20 kbar show primary phase fields for quartz (q), forsterite 0Co), enstatite (en), spinel (sp), anorthite (an), sapphirine (sa), and corundum (cor). Increasing pressure causes (1) the f o and an primary phase fields to contract, (2) the en, q, and cor fields to expand, (3) t h e f o e n boundary line to move away...
