During the Silurian, this mineral and halite were deposited in large beds in the Michigan Basin. The discovery of this mineral by the rover Opportunity is proof that water once flowed on Mars' surface. The water of crystallization present in this mineral keeps its temperature fixed at 100°C until it has all been evaporated. This fire protecting property has led to its widespread use in (*) construction. One "silky" form of this mineral, selenite, is often nicknamed "satin spar," and it also occurs as crystals with barite in formations known as "desert roses." This mineral has many practical applications such as fertilizer, plaster of Paris, and alabaster, but it may be best known for the aforementioned construction usage in drywall. For 10 points, name this mineral
During the Silurian, this mineral and halite were deposited in large beds in the Michigan Basin. The discovery of this mineral by the rover Opportunity is proof that water once flowed on Mars' surface. The water of crystallization present in this mineral keeps its temperature fixed at 100°C until it has all been evaporated. This fire protecting property has led to its widespread use in (*) construction. One "silky" form of this mineral, selenite, is often nicknamed "satin spar," and it also occurs as crystals with barite in formations known as "desert roses." This mineral has many practical applications such as fertilizer, plaster of Paris, and alabaster, but it may be best known for the aforementioned construction usage in drywall. For 10 points, name this mineral made of dihydrated calcium sulfate whose Mohs' hardness is 2.
During the Silurian, this mineral and halite were deposited in large beds in the Michigan Basin.