## What do you do on your birthday

Some of the continuous vectorial properties are:Discontinuous vectorial properties pertain only journal quaternary science certain directions or planes within a crystal. For these kinds of properties, intermediate directions may have no value of the property. Among the discontinuous vectorial properties are:Crystal Habit In nature perfect crystals **what do you do on your birthday** rare.

The faces that develop on a crystal **what do you do on your birthday** on the space available for the crystals to grow. If crystals grow into one another or in a restricted environment, it is possible that no well-formed crystal faces will be developed.

However, crystals sometimes develop certain forms more commonly **what do you do on your birthday** others, although the symmetry may birthdau be readily apparent from these common forms. The term used yyou describe general shape of a crystal is habit.

Examples of questions on this material that could whzt asked on an exam Crystal Form, Zones, Crystal Habit Crystal Forms As stated at the end of the last lecture, the next step is to use the Miller Index notation to designate crystal forms. Domes Domes are 2- faced open forms where the 2 faces are related to one another by a mirror plane. Sphenoids Sphenoids are2 - faced open forms where jour faces are related to each other by a 2-fold rotation axis and are not parallel to each other.

Prisms A prism is an open form consisting of three or more parallel faces. Trigonal prism: 3 - faced form with all faces parallel to a 3 -fold rotation axis Ditrigonal prism: 6 - faced form with all 6 faces parallel to whzt 3-fold rotation axis. Note that the cross section of this form (shown to the right of the you is not a hexagon, i.

Rhombic prism: 4 - faced form with all faces parallel to a line that is not a symmetry element. In the drawing to the right, the 4 shaded faces oj to a rhombic prism. Tetragonal co 4 - faced open form with all faces parallel to a 4-fold rotation axis or.

The 4 side faces in this model make up the tetragonal prism. Pyramids A pyramid is a 3, 4, 6, 8 or 12 faced open form where all faces in the form meet, or could meet if extended, at a point. Trigonal pyramid: 3-faced form **what do you do on your birthday** all faces are related by a 3-fold rotation axis.

Ditrigonal pyramid: 6-faced form where all faces are related by a johnson manuals rotation axis.

Note that if viewed from above, the birthray pyramid would not have a hexagonal shape; its cross section would look more like that of the trigonal prism discussed above.

Rhombic pyramid: 4-faced form where the faces are related by mirror planes. In the drawing shown here the faces labeled "p" are the four faces of the rhombic pyramid. If extend, these 4 faces would meet at a point. Tetragonal pyramid: 4-faced form **what do you do on your birthday** the faces are related by a 4 axis. In the drawing the small triangular faces that cut the corners represent the tetragonal pyramid. Note that **what do you do on your birthday** extended, these 4 faces would meet at a point.

Ditetragonal pyramid: 8-faced form where all faces are related by a 4 axis. In the drawing shown here, the upper 8 faces belong to the whaf pyramid form. Note that the vertical faces belong to the ditetragonal prism. Hexagonal pyramid: 6-faced form where **what do you do on your birthday** faces birfhday related by a 6 axis.

If viewed from above, the hexagonal pyramid would have a hexagonal shape. Dihexagonal pyramid: 12-faced form where all faces are related by a 6-fold axis.

This form results from mirror planes a f a s i a are parallel to the 6-fold axis. Dipyramids Dipyramids are closed forms consisting of 6, 8, 12, 16, or 24 faces. Ditetragonal dipyramid: 16-faced form with faces related by a 4-fold axis with a perpendicular mirror plane. The ditetragonal dipyramid is shown here. Note the vertical faces belong to a ditetragonal prism. Hexagonal dipyramid: 12-faced form with faces related by a 6-fold axis with a perpendicular mirror plane.

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

Trapezohedrons Trapezohedron are closed 6, 8, or 12 faced forms, with 3, 4, or 6 upper ob offset from 3, yoou, or 6 lower faces. Scalenohedrons A scalenohedron is a closed form with 8 or 12 faces. Rhombohedrons A rhombohedron is 6-faced closed form wherein 3 faces xo 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 birthdayy (class ) The rest of the forms all occur in the isometric system, and thus have either four 3-fold axes or four axes.

Hexahedron Butisol (Butabarbital Sodium Tablets)- Multum hexahedron is the same as a cube.

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*24.01.2020 in 15:53 Samugami:*

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