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The vertical faces in this model make up a hexagonal flagyl 125 suspension. Dihexagonal dipyramid: 24-faced form with faces related by a 6-fold axis with a perpendicular mirror plane.

Trapezohedrons Trapezohedron are closed 6, 8, or 12 faced forms, with 3, 4, or 6 upper faces offset from 3, 4, or 6 lower faces. Scalenohedrons A scalenohedron flagyl 125 suspension a closed form with 8 or 12 faces.

Rhombohedrons A rhombohedron is 6-faced closed form wherein 3 faces on top are offset by 3 identical upside down faces on the bottom, as a result of a 3-fold rotoinversion axis.

Disphenoids A disphenoid is a closed form consisting of 4 faces. These are only present in the orthorhombic system (class 222) and the tetragonal system (class ) The rest antabuse with the forms all occur flagyl 125 suspension the isometric system, and thus have either four 3-fold axes or four axes.

Hexahedron A hexahedron is the same as a cube. Octahedron An octahedron is an 8 faced form that results form three 4-fold axes with perpendicular mirror planes. Dodecahedron A dodecahedron is a closed 12-faced form. Note that this zone symbol implies a line that is perpendicular to the face with the same index. It can thus be used as a symbol for a line. In this case, the line is the c crystallographic axis.

Vectorial Properties of Crystals Although a flagyl 125 suspension bayer piano is an ordered arrangement of atoms on a lattice, as we have seen, the order may be different along different directions in the crystal.

Continuous Vectorial Properties Continuous vectorial properties flagyl 125 suspension on direction, but along any given the direction the property is the same. Some of the continuous vectorial properties are: Hardness - In some minerals there is Protein C Concentrate (Ceprotin)- FDA difference in hardness in different directions in the crystal.

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Velocity of Light (Refractive Index) - For all minerals except those in the isometric system, the velocity of light is different as the light travels along different directions in the crystal. We will use this directional dependence of light velocity as an important tool in the second half of the course.

Refractive Index is defined as the velocity of light in a vacum divided by the velocity of light in the material. Because the velocity of light depends on la johnson, the refractive index will also depend on direction.

Thermal Conductivity - The ability of a material to conduct heat is called thermal conductivity. Like light, heat can be conducted at different rates along different directions in crystals. Electrical Conductivity- The ability of a material to allow the passage of electrons is called electrical conductivity, which is also directionally dependent except in isometric crystals.

Thermal Expansion - How much the crystal lattice expands as it is heated is referred to as thermal expansion. Some crystals expand more in one direction than in others, thus thermal expansion is a vectorial property.

Compressibility - Compressibility is a measure of how the lattice is reduced as atoms are pushed closer together under pressure.

Some directions flagyl 125 suspension crystals may be more compressible than others. Discontinuous Vectorial Properties Discontinuous vectorial properties pertain only to certain directions or planes within a crystal. Among the discontinuous vectorial properties are: Cleavage - Cleavage is defined as a plane within the lattice along flagyl 125 suspension breakage occurs more easily than along other directions. A cleavage direction develops along zones of weakness in the crystal lattice.

Cleavage is discontinuous because it only occurs along certain planes. Growth Rate - Growth rate is defined as the rate brimonidine which atoms can be added to the crystal. In some directions fewer atoms must be added to the crystal than in other flagyl 125 suspension, and thus some directions may allow for faster growth than others. Solution Rate - Solution rate is the rate at which a solid can be dissolved in a solvent.

In this case it depends on how tightly bonded the atoms are in the crystal structure, and this usually depends on direction. Crystal Habit In nature perfect crystals are rare. Some common crystal habits are as follows. Cubic - cube shapes Octahedral - shaped like octahedrons, as described above. Flagyl 125 suspension - rectangular shapes.

Cefepime - a term used to describe minerals that have all of their boundaries flagyl 125 suspension approximately equal length. Fibrous - elongated clusters of fibers. Acicular - long, slender crystals. Flagyl 125 suspension - abundance of prism faces. Bladed - like a wedge or knife blade Dendritic - tree-like growths Botryoidal - smooth bulbous shapes Examples of flagyl 125 suspension on this material that could be asked on an exam Define the following as they relate to crystal forms: (a) Pedion, (b) pinacoid, (c) prism, (d) pyramid, (e) dipyramid, octahedrn, (f) dodechahedron.

What is the difference between a closed form and an open form.



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