How do black diamonds differ chemically from real diamonds?

<h3>How do black diamonds differ chemically from real diamonds?</h3>

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<strong>Central African Republic best answer:</strong>
<p><i>Answer by Alec</i><br/>"Carbonado, commonly known as the 'Black Diamond,' is a natural polycrystalline diamond found in alluvial deposits in the Central African Republic and Brazil. Its natural colour is black or dark grey, and it is more porous than other diamonds." - Wikipedia

Polycrystalline means that there are many many little diamond crystals that are stuck together with small graphytic molecules. Normal diamonds are "single" crystals - which means the the whole thing has a latticed 3D structure which repeats throughout. Polycrystalline diamonds have much different physical properties - read the Wikipedia article for further info.</p>
<p><strong>Uncompleted bridge across Ubangui River at Mobaye</strong>
<img alt="Central African Republic" src="http://farm1.staticflickr.com/143/337462858_fccc0f4781.jpg" width="400"/><br/>
<i>Image by <a href="http://www.flickr.com/photos/91702411@N00/337462858">friel</a></i>
The uncompleted bridge across the Ubangi River at Mobaye. The bridge was to connect the Central African Republic to the Democratic Republic of the Congo, but was never completed.</p>

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