# Crystal Structure

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