Molecular models of the seven crystal systems

Molecular models of the seven crystal systems


Molecular model of space group Ia-3d

Model representation of space group Ia-3d

 

Molecular Models for Crystallography

 

 

At Miramodus, we produce a wide range of models that are ideal for teaching crystallography and mineralogy. Crystallography and the understanding of symmetry in crystal structures is a hugely difficult topic for many students to grasp and, consequently, every bit as difficult for educators to teach, but our models can help in that process. Physical models of crystal structures have long been used to help students better visualize the complex arrangements of atoms within crystalline materials. Many people claim that the advent new technology, allows the easy visualisation of three dimensions. However, the truth isn't so simple: many people simply cannot perceive depth in computer images of any kind. That's because depth perception is the result of numerous factors that go beyond simple binocular vision (which is essentially all that 3d computer images rely on). Numerous depth cues - motion parallax, relative scale, relative focus, aerial and linear peerspective, and texture gradients all contribute extensively to our ability to perceive depth. If your perception of binocular disparity is relatively weak, you rely all the more on the other cues. That's why simplistic stereo media, such as 3d computer and cinema screens simply don't work for many people - it is an illusion that relies absolutely on that binocular disparity. If you are one of the significant proportion of people who don't perceive it, then the effect totally fails. For many, many people, therefore, 3d computer visualisation tools are virtually useless. The use of models, however, allows instructors to effectively illustrate concepts in crystallography and crystal-chemistry, This is best achieved when the students are allowed to manipulate the crystal models themselves and to fully interact with them; the use of models has been demonstrated to assist spatial understanding and awareness in teaching.1
 

1. The effect of student manipulation of molecular models on chemistry achievement according to Piagetian level
D. Gabel, R. Sherwood 1980 Journal of Research and Science Teaching v17 p75-81

 

Molecular models of lattice planes

Molecular models illustrating lattice planes

 

 

 

 

molecular model of coordination polyhedra

molecular model of coordination polyhedra

 

Molecular models of the 14 Bravais lattices

Molecular models of the 14 Bravais lattices