To show mineral assemblages and to identify chemical reactions, it is useful to plot the chemical compositions of minerals on a composition diagram. The majority of the minerals in the rocks you just examined have chemical compositions in the 4-component system CaO-SiO₂-MgO-H₂O. If water is treated as free to come and go (a mobile component), the mineral assemblages can be shown on a CaO-SiO₂-MgO ternary diagram. To do that, you need the chemical compositions of the individual minerals. Both the minerals and the mineral formulas are listed here. Match the mineral formulas to the minerals. Drag and drop each formula to the box next to the matching mineral name. If correct, more information will appear and the minerals will be plotted on the diagram. As an incentive to think about the formulas, every correct drop is worth 2 points. Every incorrect drop costs one point. You can drag the formula again if your answer is not correct. When you have correctly identified all the formulas, click on the "Choose a Composition Diagram" button.

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Mineral NamesMineral Formulas