Unlike earth, planet X is composed primarily of gypsum (CaSO₄ · 2H₂O) , anhydrite (CaSO₄), and barite which are sulfate minerals.

1. What do you think would be the 2 most abundant minerals that will most likely be found in planet X?

2. If the most abundant minerals were dolomite [(Ca,Mg)CO₃] , siderite (FeCO₃), and magnesite (MgCO₃), what would be the 2 most abundant elements?

3. Streak test is usually done by rubbing the mineral sample against an unglazed porcelain (streak plate). A streak plate usually has a hardness of 6.5. Suppose that the mineral X has a hardness of 7.5. Will you be able to get the streak of mineral X using the streak plate?

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