Coordination Polyhdera by Number
4
What is tetrahedral?
4+
What is the charge for Si?
What is biotite?
Pauling's first rule (Hint: Utilizes ionic radii.)
What is the coordination principle?
Smallest repeat unit that defines all the symmetry of a crystal
What is a unit cell?
3
What is triangular?
Feldspar
What is the most abundant mineral in Earth's crust?
Rose
What is rose quartz? (or What is a variety of quartz?)
Describes the way in which polyhedra of the same type are connected.
What is Pauling's third rule?
Oppositely charged ion with the shortest distance from the ion of interest.
What is a nearest neighbor?
8
What is cubic?
4
What is the coordination number for Si?
Clear/Transparent
What is quartz?
What is Pauling's fourth rule?
Number of nearest neighbors surrounding an ion of interest.
What is the coordination number?
6
What is octahedral?
[SiO4]4-
What is a silicate anion group (or silica tetrahedron)?
Green
What is olivine?
Occam's razor of crystal chemistry
What is Pauling's fifth rule (What is the rule of parsimony)?
Shape formed when connecting the nearest neighbor ions with the ion of interest in the center.
What is a coordination polyhedron?
12
What is close-packed (or large)?
Silica polymerization
How do silica connect to form different silicate minerals?
Chalky white
What is kaolinite?
Pauling's second rule (Hint: Utilizes CN and charge.)
What is the electrostatic valency principle? (or bond strength principle)
The component of a polyhedron that is shared with a polyhedron of the same chemistry (e.g., corner, edge, or face).
What is a polyhedral element?