Mineralogy

Question 1

Radius Ratio Principle: Cation-anion distances are equal to the sum of their effective ionic radii, and cation coordination numbers are determined by the ratio of cation to anion radii.

Answer 1

Pauling’s First Rule

Question 2

Electrostatic Valency Principle: The strength of an ionic bond is equal to ionic charge divided by coordination number.

Answer 2

Pauling’s Second Rule

Question 3

Sharing of edges or faces by coordinating polyhedra is inherently unstable..

Answer 3

Pauling’s Third Rule

Question 4

Cations of high valence and small coordination number tend to not share anions with other cations.

Answer 4

Pauling’s Fourth Rule

Question 5

Principle of Parsimony: The number of different components in a crystal tends to be small.

Answer 5

Pauling’s Fifth Rule

Question 6

Top 8 most common elements in Earth’s crust

Answer 6

1. O
2. Si
3. Al
4. Fe
5. Ca
6. Na
7. K
8. Mg

Question 7

What element is more common in the mantle than the crust?

Answer 7

Magnesium

Question 8

defines the basic building blocks of the crystal and the entire crystal is
made up of repeatedly translated unit cells

Answer 8

Unit Cell