Question: Problem 3: Vaterite - hexagonal CaCO3 Vaterite is a polymorph of calcium carbonate. Its chemical formula is CaCO3 and molecular weights of the elements Ca,

Problem 3: Vaterite - hexagonal CaCO3 Vaterite is a polymorph of

Problem 3: Vaterite - hexagonal CaCO3 Vaterite is a polymorph of calcium carbonate. Its chemical formula is CaCO3 and molecular weights of the elements Ca, C and O are 40, 12 and 16 g/mol, respectively. There are two models describing the structure of vaterite - a hexagonal polymorph of calcium carbonate, CaCO3 (i) - standard hexagonal setting with a = 4.130 , c = 8.49 ; (ii) - another hexagonal setting with larger translation vectors: a = 7.153 , c = 16.98 . Tasks: Q 3-1: How many molecules of CaCO3 are located in the unit cells mentioned, if the density of vaterite is 2.67 g/cm? (6 marks) Q 3-2: Find the relationship between translation vectors in these two settings and draw their mutual configuration in the hexagonal plane. (6 marks) Q 3-3: Find the Miller indices of a certain atomic plane in the second setting if, in the standard one, the Miller indices are (102). (6 marks)

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