1. The solar system is constituted of about 88 elements that can be considered chemical components. How many phases make an invariant assemblage in the solar system?
2. The composition of the mineral Staceyite is indicated with a X on the diagram below. What is the composition of Staceyite in terms of XSiO2?
How about XMgO?
3. There is a rare mineral called Jesseite, with XSiO2=0.5.
Draw the stable chemographies for the divariant assemblage from each side of the reaction Quartz + Staceyite = Jesseite.