'Miller index' diaporamas de présentation

3-D Symmetry

3-D Symmetry. The 32 3-D Point Groups The symmetry of every crystal of a mineral must conform to one of them. This includes every point within a crystal. Of the 32 point groups, 21 contain a centre of symmetry and 11 do not. These are called

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Definition of the crystalline state: Crystals are solids (but not all solids are crystals!) ?

Definition of the crystalline state: Crystals are solids (but not all solids are crystals!) ? Crystals are the most ordered form of the matter Crystal are 3-D (2-D) regular arrays of ions, atoms, molecules; they have triple (double) periodicity Crystals have long range order.

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Crystallographic Points, Directions, and Planes.

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Objectives

Objectives. By the end of this section you should: understand the concept of planes in crystals know that planes are identified by their Miller Index and their separation, d be able to calculate Miller Indices for planes know and be able to use the d-spacing equation for orthogonal crystals

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Objectives

Objectives. By the end of this section you should: understand the concept of planes in crystals know that planes are identified by their Miller Index and their separation, d be able to calculate Miller Indices for planes know and be able to use the d-spacing equation for orthogonal crystals

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Objectives

Objectives. By the end of this section you should: understand the concept of planes in crystals know that planes are identified by their Miller Index and their separation, d be able to calculate Miller Indices for planes know and be able to use the d-spacing equation for orthogonal crystals

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Materials

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Miller Index: or How we name crystal faces

Miller Index: or How we name crystal faces. b. a. What is the Miller Index of the pink plane (assume c is coming out of the slide?. b. a. Pink. b. a. Green. c. b. a. What is the Miller Index of the Pink plane?. c. b. a. What is the Miller Index of the Green plane?.

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Miller Indices

Miller Indices. By : Cody, David, and Shane. Inventor of Miller indices. This scheme, devised by British mineralogist and crystallographer William Hallowes Miller, in 1839, has the advantage of eliminating all fractions from the notation for a plane. Definition of Miller Indices.

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