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Crystal Systems and more. Crystal Morphology. Within a given internal structure, a limited number of planes bound a crystal and only comparatively few are common
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Crystal Morphology • Within a given internal structure, a limited number of planes bound a crystal and only comparatively few are common • Faces are most likely to form parallel to lattice planes which have a high density of lattice points (or nodes) known as Law of Bravais
Lattice Types • P Primitive • A,B,C, Side-centered • F Face-centered • I Body-centered
Bravais Lattice Link
How to orient a crystal • Crystallographic axes are generally taken parallel to the intersection of major crystal faces • And why do I care? Coming soon!
Forms • A form is a group of faces related by symmetry!! • Do not forget • Open forms vs closed forms
What forms are you responsible for? • Pedion • Pinacoid • Prism (hexagonal, rhombic, tetragonal) • Pyramid • Dipyramid • Scalenohedron • Cube • Octahedron • Tetrahedron • Rhombic Dodecahedron • Pyritohedron (Pentagonal Dodecahedron) • Rhombohedron • Disphenoid • Dihedron • Trapezohedron
Open Forms General term for dome and sphenoid is dihedron
Some closed isometric forms pyritohedron trapezohedron
Some others • Scalenohedron • Rhombohedron • Disphenoid Right and left handed disphenoids
Stereographic Projection • Let’s go to your cd