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Crystal Structure
part of Ch. 2
38
Chemistry
Undergraduate 4
01/16/2017

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Term
how crystal systems are described in mineralogy
Definition
using lattices of points
Term
unit cell
Definition
this is created by joining the points of the space lattice to produce a series of parallel-sided boxes
Term
each unit cell contains...
Definition
a complete unit of the crystal pattern, because the complete pattern is reproduced at each lattice point
Term
how the particular unit cell is chosen for a space lattice
Definition
generally selected as a matter of convenience in visualizing the symmetry and making the mathematical computations
Term
the unit cell is defined by...
Definition
the parameters a, b, and c (the x, y, and z dimensions of the unit cell) and the angles α, β, and γ
Term
the angle α in unit cells
Definition
the angle between the b and c axes
Term
the angle β in unit cells
Definition
the angle between the a and c axes
Term
the angle γ in unit cells
Definition
the angle between the a and b axes
Term
unit cell formula
Definition
the chemical composition of a unit cell in a mineral
Term
the difference between crystal structure and crystal lattice
Definition
-a crystal structure is real and tangible; describes the actual physical assemblages of atoms in the structure
-a crystal lattice is conceptual and reflects an infinite and uniform distribution of points in space
Term
the number of unique ways in which lattice points can be arranged in 3D space
Definition
14
Term
the Bravais lattices
Definition
the types of lattices that occur in minerals
Term
the Bravais lattices are divided into 6 ______ based on ______.
Definition
crystal systems
the symmetry of the 3D structure
Term
the Bravais types
Definition
-P -C -I -F -R
Term
Bravis type P
Definition
primitive lattice
Term
Bravis type C
Definition
primitive lattice that includes a lattice point centered in the ab plane of the monoclinic system
Term
Bravis type I
Definition
primitive lattice that includes a lattice point that is centered within the body of the primitive lattice (termed body centered) of the cubic, tetragonal, and orthorhombic systems
Term
Bravis type F
Definition
primitive lattice that includes lattice points centered on all faces of the primitive lattice of the cubic and orthorhombic systems
Term
Bravis type R
Definition
the rhombohedral (trigonal) lattice type of the hexagonal system
Term
how crystal systems are described in mineralogy
Definition
using lattices of points
Term
unit cell
Definition
this is created by joining the points of the space lattice to produce a series of parallel-sided boxes
Term
each unit cell contains...
Definition
a complete unit of the crystal pattern, because the complete pattern is reproduced at each lattice point
Term
how the particular unit cell is chosen for a space lattice
Definition
generally selected as a matter of convenience in visualizing the symmetry and making the mathematical computations
Term
the unit cell is defined by...
Definition
the parameters a, b, and c (the x, y, and z dimensions of the unit cell) and the angles α, β, and γ
Term
the angle α in unit cells
Definition
the angle between the b and c axes
Term
the angle β in unit cells
Definition
the angle between the a and c axes
Term
the angle γ in unit cells
Definition
the angle between the a and b axes
Term
unit cell formula
Definition
the chemical composition of a unit cell in a mineral
Term
the difference between crystal structure and crystal lattice
Definition
-a crystal structure is real and tangible; describes the actual physical assemblages of atoms in the structure
-a crystal lattice is conceptual and reflects an infinite and uniform distribution of points in space
Term
the number of unique ways in which lattice points can be arranged in 3D space
Definition
14
Term
the Bravais lattices
Definition
the types of lattices that occur in minerals
Term
the Bravais lattices are divided into 6 ______ based on ______.
Definition
crystal systems
the symmetry of the 3D structure
Term
the Bravais types
Definition
-P -C -I -F -R
Term
Bravis type P
Definition
primitive lattice
Term
Bravis type C
Definition
primitive lattice that includes a lattice point centered in the ab plane of the monoclinic system
Term
Bravis type I
Definition
primitive lattice that includes a lattice point that is centered within the body of the primitive lattice (termed body centered) of the cubic, tetragonal, and orthorhombic systems
Term
Bravis type F
Definition
primitive lattice that includes lattice points centered on all faces of the primitive lattice of the cubic and orthorhombic systems
Term
Bravis type R
Definition
the rhombohedral (trigonal) lattice type of the hexagonal system
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