Introduction to Crystallography - Lecture 1

A natural solid body, with a regular atomic arrangement, a certain chemical composition, and bounded by plane surfaces.

A branch of science focused on the geometry of internal structure and physical properties of crystalline materials.

<p>Structural crystallography and Geometrical crystallography</p> Signup and view all the answers

<p>Crystalline solids have regular, periodic arrangements of atoms or molecules, while amorphous solids have random arrangements.</p> Signup and view all the answers

<p>To measure the interfacial angles of a crystal.</p> Signup and view all the answers

<p>Faces, edges, and solid angles.</p> Signup and view all the answers

<p>A group of crystal faces sharing the same relationship to the elements of symmetry within a given crystal system.</p> Signup and view all the answers

The study of the geometric arrangement of atoms within crystalline materials and the physical properties that arise from this arrangement.

A naturally occurring solid with a specific chemical composition and a regular, repeating internal arrangement of atoms.

A solid with a highly ordered, repeating arrangement of atoms, ions or molecules. Examples include diamonds, salt, and quartz.

The process of forming a crystalline structure from a liquid or dissolved material. Like water turning into ice or salt crystallizing from a solution.

The force that holds atoms together in a crystal. Examples include ionic, covalent, and metallic bonding.

A positively charged ion in a crystal. It forms by losing electrons.

A negatively charged ion in a crystal. It forms by gaining electrons.

The number of ions or atoms surrounding a central atom or ion in a crystal structure. It influences the shape and properties of the crystal.

The arrangement of atoms in a repeating pattern, creating a specific crystal shape.

A specific group of crystal faces that share a common relationship to the elements of symmetry.

A flat surface on a crystal.

The line formed where two adjacent crystal faces meet.

The point at which three or more crystal faces meet.

The angle between two adjacent crystal faces. It is a crucial characteristic for mineral identification.

A three-dimensional solid with straight edges and flat faces. Examples include cubes, pyramids, and prisms.

The ability of a crystal to cleave along specific planes, producing smooth, flat surfaces.

The tendency of a mineral to break along irregular, uneven surfaces. It's the opposite of cleavage.

A crystal's tendency to resist scratching. It's a measure of its hardness.

The color of a mineral when it is powdered.

The way a mineral reflects light. It can be metallic, glassy, dull, etc.

The weight of a mineral compared to an equal volume of water.

The tendency of a crystal to grow in a specific shape based on its atomic arrangement.

The internal structure of a crystal, which is a repeating arrangement of atoms.

A set of three axes that are used to describe the orientation of a crystal.

A representation of a crystal's structure, showing the relative positions of its atoms.

A group of symbols that represent a crystal face by its intercepts with the crystallographic axes.

The relative lengths of the crystallographic axes.

The points where a crystal face intersects the crystallographic axes.

A symmetry operation that involves rotating a crystal about an axis.

A symmetry operation that involves reflecting a crystal across a plane.

A symmetry operation that involves inverting a crystal through a point.

A group of symmetry operations that describe the symmetry of a crystal.