Earlier, I corrected the example on the material cause and someone did a reversion. Now it is incorrect. I also did a small summation on Aritstotle's intent regarding the four causes and that has been removed. I hope the erroneous example set by these discrepancies does not speak for the whole article. I will probably revert the article to my corrections - just letting you know. I also had citations to back up my corrections and additions. Both the material cause and the formal cause are based in causation. What you have is not causation. And you have no citations in this whole section. I bet a look at the next two causes would reveal the same errors.  
 In addition, I don't see any in line citations from which these erroneous definitions and examples are derived from. In other words, what are your references?  
 Anyway, I corrected the material cause and added some to the formal cause. Yet, I see that your definition for the formal cause and what you had for the material cause are not founded in causation - causation of the existence of a thing in other words, is the lense through which these are viewed.