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Crystal Systems and more

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

samuel-hodge
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Crystal Systems and more

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  1. Crystal Systems and more

  2. 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

  3. Law of Bravais

  4. Lattice Types • P Primitive • A,B,C, Side-centered • F Face-centered • I Body-centered

  5. Bravais Lattice Link

  6. 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!

  7. Forms • A form is a group of faces related by symmetry!! • Do not forget • Open forms vs closed forms

  8. 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

  9. Open Forms General term for dome and sphenoid is dihedron

  10. Prisms

  11. Some closed isometric forms pyritohedron trapezohedron

  12. Some others • Scalenohedron • Rhombohedron • Disphenoid Right and left handed disphenoids

  13. Square dipyramid and prism

  14. Stereographic Projection • Let’s go to your cd

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