This video walks through how to calculate packing efficiency of unit cells.

The magazine Chemical & Engineering News recently ran a feature article on the rapidly changing gemstone market and the role that synthetic diamonds and other gemstones are playing.

http://cen.acs.org/articles/95/i5/synthesized-precious-gems-passing-natural.html

This paper covers ways to identify synthesized gemstones and includes detailed images illustrating defects in synthesized gemstones.

This paper discusses different types of gemstones as well as methods utilized in synthesizing gemstones.

A quick video reviewing Fajans’ Rules for determining covalent versus ionic bonding.

A couple of examples given and also an example relating to the melting point of substances.

https://www.youtube.com/watch?v=u-bF5cQqhnI

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Two review websites covering metallic and ionic solids.

http://www.chem.fsu.edu/chemlab/chm1046course/solids.html

http://www.chem1.com/acad/webtext/states/crystals-cubic.html

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A large collection of rotatable, interactive structures. From small molecules to metallic or ionic solids, this collection may have the molecule you are trying to see in 3D.

http://www.chemtube3d.com

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Make your own 3D lattices using simple “origami”. (Tape required, unfortunately.)

https://www.ionicviper.org/system/files/LatticeSystemsOrigami-templates.pdf

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Animated packing diagrams, lattice descriptions, and much more. A great resource for metallic bonding and salt/oxide structure. Don’t miss the navigation at the bottom of the page, where you can choose different lattice types.

http://departments.kings.edu/chemlab/animation/index.html

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