Working with silicate crystal structures

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Reference no: EM133208131 , Length: Word count: 3 Pages

Assignment Part I: Working with Silicate Crystal Structures

Diopside Structure (Silica: dark blue, Oxygen: red, Mg: orange, Ca: light blue) (16 points)

a. Looking only at the silica tetrahedra, determine the unit cell of this structure and clearly describe it.

b. How many oxygen atoms are shared with another unit cell?

c. How many of the oxygen atoms belong ONLY to this unit cell?

d. How many Si cations are found in each unit cell?

e. What is the Si/O ratio of the diopside structure? (Count shared oxygens as ½)

f. What is the silicate classification for this mineral structure? Be specific.

g. What is the coordination number of Mg? Are all Mg in equivalent polyhedra?

h. What is the coordination number of Ca? Are all Ca in equivalent polyhedra?

i. Describe the coordination polyhedron for Ca

j. Do the adjacent Capolyhedra share corners, edges, or faces?

k. Do the adjacent Mgpolyhedra share corners, edges, or faces?

Assignment Part II: Tourmaline Structure (Silica: yellow, Oxygen: red, Sodium: green, Magnesium: purple, Bore: blue, Aluminum: light blue)

a. Describe the silica tetrahedra arrangement.

b. How many oxygen atoms are shared with another unit cell?

c. How many of the oxygen atoms belong ONLY to this unit cell?

d. How many Si cations are found in each unit cell?

e. What is the Si/O ratio of the diopside structure? (Count shared oxygens as ½)

f. What is the silicate classification for this mineral structure? Be specific.

g. What are coordination numbers of Na, Mg, B and Al?

h. Are all Al in equivalent polyhedra?

i. Describe clearly the location of the Na cations in the structure. (the c-axis is perpendicular to the plan forming the silica ring - tourmaline belongs to the trigonal system)

Reference no: EM133208131

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